# PhysicsFS; a portable, flexible file i/o abstraction.

# Copyright (C) 2007  Ryan C. Gordon.

#

# Please see the file LICENSE.txt in the source's root directory.

#lines overridden by Hedgewars configuration

#CMAKE_MINIMUM_REQUIRED(VERSION 2.4)

#PROJECT(PhysicsFS)

set(PHYSFS_VERSION 2.1.0)

# Increment this if/when we break backwards compatibility.

set(PHYSFS_SOVERSION 1)

# I hate that they define "WIN32" ... we're about to move to Win64...I hope!

if(WIN32 AND NOT WINDOWS)

    set(WINDOWS true)

endif(WIN32 AND NOT WINDOWS)

# Bleh, let's do it for "APPLE" too.

if(APPLE AND NOT MACOSX)

    set(MACOSX true)

endif(APPLE AND NOT MACOSX)

# For now, Haiku and BeOS are the same, as far as the build system cares.

if(HAIKU AND NOT BEOS)

    set(BEOS true)

endif(HAIKU AND NOT BEOS)

if(CMAKE_SYSTEM_NAME STREQUAL "SunOS")

    set(SOLARIS true)

endif(CMAKE_SYSTEM_NAME STREQUAL "SunOS")

include(CheckIncludeFile)

include(CheckLibraryExists)

include(CheckCSourceCompiles)

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)

include_directories(${SDL_INCLUDE_DIR}) #hw

include_directories(${LUA_INCLUDE_DIR}) #hw

if(MACOSX)

    # Fallback to older OS X on PowerPC to support wider range of systems...

    if(CMAKE_OSX_ARCHITECTURES MATCHES ppc)

        add_definitions(-DMAC_OS_X_VERSION_MIN_REQUIRED=1020)

        set(OTHER_LDFLAGS ${OTHER_LDFLAGS} " -mmacosx-version-min=10.2")

    endif(CMAKE_OSX_ARCHITECTURES MATCHES ppc)

    # Need these everywhere...

    add_definitions(-fno-common)

    set(OTHER_LDFLAGS ${OTHER_LDFLAGS} "-framework IOKit")

endif(MACOSX)

# Add some gcc-specific command lines.

if(CMAKE_COMPILER_IS_GNUCC)

    # Always build with debug symbols...you can strip it later.

    add_definitions(-g -pipe -Werror -fsigned-char)

    # Stupid BeOS generates warnings in the system headers.

    if(NOT BEOS)

        add_definitions(-Wall)

    endif(NOT BEOS)

    CHECK_C_SOURCE_COMPILES("

        #if ((defined(__GNUC__)) && (__GNUC__ >= 4))

        int main(int argc, char **argv) { int is_gcc4 = 1; return 0; }

        #else

        #error This is not gcc4.

        #endif

    " PHYSFS_IS_GCC4)

    if(PHYSFS_IS_GCC4)

        # Not supported on several operating systems at this time.

        if(NOT SOLARIS AND NOT WINDOWS)

            add_definitions(-fvisibility=hidden)

        endif(NOT SOLARIS AND NOT WINDOWS)

    endif(PHYSFS_IS_GCC4)

    # Don't use -rpath.

    set(CMAKE_SKIP_RPATH ON CACHE BOOL "Skip RPATH" FORCE)

endif(CMAKE_COMPILER_IS_GNUCC)

if(CMAKE_C_COMPILER_ID STREQUAL "SunPro")

    add_definitions(-erroff=E_EMPTY_TRANSLATION_UNIT)

    add_definitions(-xldscope=hidden)

endif(CMAKE_C_COMPILER_ID STREQUAL "SunPro")

if(MSVC)

    # VS.NET 8.0 got really really anal about strcpy, etc, which even if we

    #  cleaned up our code, zlib, etc still use...so disable the warning.

    add_definitions(-D_CRT_SECURE_NO_WARNINGS=1)

endif(MSVC)

# Basic chunks of source code ...

set(LZMA_SRCS

    src/lzma/C/7zCrc.c

    src/lzma/C/Archive/7z/7zBuffer.c

    src/lzma/C/Archive/7z/7zDecode.c

    src/lzma/C/Archive/7z/7zExtract.c

    src/lzma/C/Archive/7z/7zHeader.c

    src/lzma/C/Archive/7z/7zIn.c

    src/lzma/C/Archive/7z/7zItem.c

    src/lzma/C/Archive/7z/7zMethodID.c

    src/lzma/C/Compress/Branch/BranchX86.c

    src/lzma/C/Compress/Branch/BranchX86_2.c

    src/lzma/C/Compress/Lzma/LzmaDecode.c

)

if(BEOS)

    # We add this explicitly, since we don't want CMake to think this

    #  is a C++ project unless we're on BeOS.

    set(PHYSFS_BEOS_SRCS src/platform_beos.cpp)

    find_library(BE_LIBRARY be)

    find_library(ROOT_LIBRARY root)

    set(OPTIONAL_LIBRARY_LIBS ${OPTIONAL_LIBRARY_LIBS} ${BE_LIBRARY} ${ROOT_LIBRARY})

endif(BEOS)

# Almost everything is "compiled" here, but things that don't apply to the

#  build are #ifdef'd out. This is to make it easy to embed PhysicsFS into

#  another project or bring up a new build system: just compile all the source

#  code and #define the things you want.

set(PHYSFS_SRCS

    src/physfs.c

    src/physfs_byteorder.c

    src/physfs_unicode.c

    src/platform_posix.c

    src/platform_unix.c

    src/platform_macosx.c

    src/platform_windows.c

    src/archiver_dir.c

    src/archiver_unpacked.c

    src/archiver_grp.c

    src/archiver_hog.c

    src/archiver_lzma.c

    src/archiver_mvl.c

    src/archiver_qpak.c

    src/archiver_wad.c

    src/archiver_zip.c

    src/archiver_iso9660.c

    #custom files from Hedgewars

    extras/physfsrwops.c

    extras/physfslualoader.c

    extras/hwpacksmounter.c

    ${PHYSFS_BEOS_SRCS}

)

# platform layers ...

if(UNIX)

    if(BEOS)

        set(PHYSFS_HAVE_CDROM_SUPPORT true)

        set(PHYSFS_HAVE_THREAD_SUPPORT true)

        set(HAVE_PTHREAD_H true)

    else(BEOS)

        CHECK_INCLUDE_FILE(sys/ucred.h HAVE_UCRED_H)

        if(HAVE_UCRED_H)

            add_definitions(-DPHYSFS_HAVE_SYS_UCRED_H=1)

            set(PHYSFS_HAVE_CDROM_SUPPORT false)

        endif(HAVE_UCRED_H)

        CHECK_INCLUDE_FILE(mntent.h HAVE_MNTENT_H)

        if(HAVE_MNTENT_H)

            add_definitions(-DPHYSFS_HAVE_MNTENT_H=1)

            set(PHYSFS_HAVE_CDROM_SUPPORT false)

        endif(HAVE_MNTENT_H)

        # !!! FIXME: Solaris fails this, because mnttab.h implicitly

        # !!! FIXME:  depends on other system headers.  :(

        #CHECK_INCLUDE_FILE(sys/mnttab.h HAVE_SYS_MNTTAB_H)

        CHECK_C_SOURCE_COMPILES("

            #include <stdio.h>

            #include <sys/mnttab.h>

            int main(int argc, char **argv) { return 0; }

        " HAVE_SYS_MNTTAB_H)

        if(HAVE_SYS_MNTTAB_H)

            add_definitions(-DPHYSFS_HAVE_SYS_MNTTAB_H=1)

            set(PHYSFS_HAVE_CDROM_SUPPORT false)

        endif(HAVE_SYS_MNTTAB_H)

        CHECK_INCLUDE_FILE(pthread.h HAVE_PTHREAD_H)

        if(HAVE_PTHREAD_H)

            set(PHYSFS_HAVE_THREAD_SUPPORT false)

        endif(HAVE_PTHREAD_H)

    endif(BEOS)

endif(UNIX)

if(WINDOWS)

    set(PHYSFS_HAVE_CDROM_SUPPORT true)

    set(PHYSFS_HAVE_THREAD_SUPPORT true)

endif(WINDOWS)

if(NOT PHYSFS_HAVE_CDROM_SUPPORT)

    add_definitions(-DPHYSFS_NO_CDROM_SUPPORT=1)

    message(WARNING " ***")

    message(WARNING " *** There is no CD-ROM support in this build!")

    message(WARNING " *** PhysicsFS will just pretend there are no discs.")

    message(WARNING " *** This may be fine, depending on how PhysicsFS is used,")

    message(WARNING " ***   but is this what you REALLY wanted?")

    message(WARNING " *** (Maybe fix CMakeLists.txt, or write a platform driver?)")

    message(WARNING " ***")

endif(NOT PHYSFS_HAVE_CDROM_SUPPORT)

if(PHYSFS_HAVE_THREAD_SUPPORT)

    add_definitions(-D_REENTRANT -D_THREAD_SAFE)

else(PHYSFS_HAVE_THREAD_SUPPORT)

    add_definitions(-DPHYSFS_NO_THREAD_SUPPORT=1)

    message(WARNING " ***")

    message(WARNING " *** There is no thread support in this build!")

    message(WARNING " *** PhysicsFS will NOT be reentrant!")

    message(WARNING " *** This may be fine, depending on how PhysicsFS is used,")

    message(WARNING " ***   but is this what you REALLY wanted?")

    message(WARNING " *** (Maybe fix CMakeLists.txt, or write a platform driver?)")

    message(WARNING " ***")

endif(PHYSFS_HAVE_THREAD_SUPPORT)

# Archivers ...

option(PHYSFS_ARCHIVE_ZIP "Enable ZIP support" true)

if(PHYSFS_ARCHIVE_ZIP)

    add_definitions(-DPHYSFS_SUPPORTS_ZIP=1)

endif(PHYSFS_ARCHIVE_ZIP)

option(PHYSFS_ARCHIVE_7Z "Enable 7zip support" false)

if(PHYSFS_ARCHIVE_7Z)

    add_definitions(-DPHYSFS_SUPPORTS_7Z=1)

    # !!! FIXME: rename to 7z.c?

    set(PHYSFS_SRCS ${PHYSFS_SRCS} ${LZMA_SRCS})

endif(PHYSFS_ARCHIVE_7Z)

option(PHYSFS_ARCHIVE_GRP "Enable Build Engine GRP support" true)

if(PHYSFS_ARCHIVE_GRP)

    add_definitions(-DPHYSFS_SUPPORTS_GRP=1)

endif(PHYSFS_ARCHIVE_GRP)

option(PHYSFS_ARCHIVE_WAD "Enable Doom WAD support" true)

if(PHYSFS_ARCHIVE_WAD)

    add_definitions(-DPHYSFS_SUPPORTS_WAD=1)

endif(PHYSFS_ARCHIVE_WAD)

option(PHYSFS_ARCHIVE_HOG "Enable Descent I/II HOG support" true)

if(PHYSFS_ARCHIVE_HOG)

    add_definitions(-DPHYSFS_SUPPORTS_HOG=1)

endif(PHYSFS_ARCHIVE_HOG)

option(PHYSFS_ARCHIVE_MVL "Enable Descent I/II MVL support" true)

if(PHYSFS_ARCHIVE_MVL)

    add_definitions(-DPHYSFS_SUPPORTS_MVL=1)

endif(PHYSFS_ARCHIVE_MVL)

option(PHYSFS_ARCHIVE_QPAK "Enable Quake I/II QPAK support" true)

if(PHYSFS_ARCHIVE_QPAK)

    add_definitions(-DPHYSFS_SUPPORTS_QPAK=1)

endif(PHYSFS_ARCHIVE_QPAK)

option(PHYSFS_ARCHIVE_ISO9660 "Enable ISO9660 support" true)

if(PHYSFS_ARCHIVE_ISO9660)

    add_definitions(-DPHYSFS_SUPPORTS_ISO9660=1)

endif(PHYSFS_ARCHIVE_ISO9660)

#as needed by Hedgewars configuration

if(WINDOWS)

    option(PHYSFS_BUILD_STATIC "Build static library" false)

    option(PHYSFS_BUILD_SHARED "Build shared library" true)

    set(OTHER_LDFLAGS ${OTHER_LDFLAGS} ${SDL_LIBRARY})

else(WINDOWS)

    option(PHYSFS_BUILD_STATIC "Build static library" true)

    option(PHYSFS_BUILD_SHARED "Build shared library" false)

endif(WINDOWS)

if(PHYSFS_BUILD_STATIC)

    add_library(physfs STATIC ${PHYSFS_SRCS})

    set_target_properties(physfs PROPERTIES OUTPUT_NAME "physfs")

    set(PHYSFS_LIB_TARGET physfs)

    set(PHYSFS_INSTALL_TARGETS ${PHYSFS_INSTALL_TARGETS} ";physfs")

endif(PHYSFS_BUILD_STATIC)

if(PHYSFS_BUILD_SHARED)

    find_package(SDL REQUIRED)

    add_library(physfs SHARED ${PHYSFS_SRCS})

    set_target_properties(physfs PROPERTIES VERSION ${PHYSFS_VERSION})

    set_target_properties(physfs PROPERTIES SOVERSION ${PHYSFS_SOVERSION})

    target_link_libraries(physfs ${OPTIONAL_LIBRARY_LIBS} ${OTHER_LDFLAGS})

    set(PHYSFS_LIB_TARGET physfs)

    set(PHYSFS_INSTALL_TARGETS ${PHYSFS_INSTALL_TARGETS} ";physfs")

    install(TARGETS ${PHYSFS_INSTALL_TARGETS}

            RUNTIME DESTINATION bin)

endif(PHYSFS_BUILD_SHARED)

if(NOT PHYSFS_BUILD_SHARED AND NOT PHYSFS_BUILD_STATIC)

    message(FATAL "Both shared and static libraries are disabled!")

endif(NOT PHYSFS_BUILD_SHARED AND NOT PHYSFS_BUILD_STATIC)

# CMake FAQ says I need this...

if(PHYSFS_BUILD_SHARED AND PHYSFS_BUILD_STATIC)

    set_target_properties(physfs PROPERTIES CLEAN_DIRECT_OUTPUT 1)

endif(PHYSFS_BUILD_SHARED AND PHYSFS_BUILD_STATIC)

option(PHYSFS_BUILD_TEST "Build stdio test program." false)

mark_as_advanced(PHYSFS_BUILD_TEST)

if(PHYSFS_BUILD_TEST)

    find_path(READLINE_H readline/readline.h)

    find_path(HISTORY_H readline/history.h)

    if(READLINE_H AND HISTORY_H)

        find_library(CURSES_LIBRARY NAMES curses ncurses)

        set(CMAKE_REQUIRED_LIBRARIES ${CURSES_LIBRARY})

        find_library(READLINE_LIBRARY readline)

        if(READLINE_LIBRARY)

            set(HAVE_SYSTEM_READLINE true)

            set(TEST_PHYSFS_LIBS ${TEST_PHYSFS_LIBS} ${READLINE_LIBRARY} ${CURSES_LIBRARY})

            include_directories(${READLINE_H} ${HISTORY_H})

            add_definitions(-DPHYSFS_HAVE_READLINE=1)

        endif(READLINE_LIBRARY)

    endif(READLINE_H AND HISTORY_H)

    add_executable(test_physfs test/test_physfs.c)

    target_link_libraries(test_physfs ${PHYSFS_LIB_TARGET} ${TEST_PHYSFS_LIBS} ${OTHER_LDFLAGS})

    set(PHYSFS_INSTALL_TARGETS ${PHYSFS_INSTALL_TARGETS} ";test_physfs")

endif(PHYSFS_BUILD_TEST)

# Scripting language bindings...

#CMake's SWIG support is basically useless.

#FIND_PACKAGE(SWIG)

option(PHYSFS_BUILD_SWIG "Build ${_LANG} bindings." false)

mark_as_advanced(PHYSFS_BUILD_SWIG)

find_program(SWIG swig DOC "Path to swig command line app: http://swig.org/")

if(NOT SWIG)

    message(STATUS "SWIG not found. You won't be able to build scripting language bindings.")

else(NOT SWIG)

    mark_as_advanced(SWIG)

    if(DEFINED CMAKE_BUILD_TYPE)

        if((NOT CMAKE_BUILD_TYPE STREQUAL "") AND (NOT CMAKE_BUILD_TYPE STREQUAL "Debug"))

            if(CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")

                set(SWIG_OPT_CFLAGS "-small")

            else(CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")

                set(SWIG_OPT_CFLAGS "-O")

            endif(CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")

        endif((NOT CMAKE_BUILD_TYPE STREQUAL "") AND (NOT CMAKE_BUILD_TYPE STREQUAL "Debug"))

    endif(DEFINED CMAKE_BUILD_TYPE)

    set(SWIG_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/physfs-swig-bindings")

    macro(CONFIGURE_SWIG_BINDING _LANG _INSTALLPATH _EXTRAOUTPUTS _EXTRACFLAGS _EXTRALDFLAGS)

        string(TOUPPER "${_LANG}" _UPPERLANG)

        string(TOLOWER "${_LANG}" _LOWERLANG)

        set(_TARGET "physfs-${_LOWERLANG}")

        set(_TARGETDIR "${SWIG_OUTPUT_DIR}/${_LOWERLANG}")

        if(NOT EXISTS "${_TARGETDIR}")

            file(MAKE_DIRECTORY "${_TARGETDIR}")

        endif(NOT EXISTS "${_TARGETDIR}")

        if(PHYSFS_BUILD_${_UPPERLANG})

            add_custom_command(

                OUTPUT "${_TARGETDIR}/${_TARGET}.c" ${_EXTRAOUTPUTS}

                MAIN_DEPENDENCY "${CMAKE_CURRENT_SOURCE_DIR}/extras/physfs-swig.i"

                COMMAND "${SWIG}"

                ARGS ${SWIG_OPT_CFLAGS} -${_LOWERLANG} -outdir "${_TARGETDIR}" -o "${_TARGETDIR}/${_TARGET}.c" "${CMAKE_CURRENT_SOURCE_DIR}/extras/physfs-swig.i"

                COMMENT "Generating ${_LANG} bindings..."

            )

            add_library(${_TARGET} SHARED "${_TARGETDIR}/${_TARGET}.c")

            target_link_libraries(${_TARGET} ${PHYSFS_LIB_TARGET})

            set_target_properties(${_TARGET} PROPERTIES

                COMPILE_FLAGS "${_EXTRACFLAGS}"

                LINK_FLAGS "${_EXTRALDFLAGS}"

                LIBRARY_OUTPUT_NAME "physfs"

                LIBRARY_OUTPUT_DIRECTORY "${_TARGETDIR}"

                CLEAN_DIRECT_OUTPUT 1

            )

            install(TARGETS ${_TARGET} LIBRARY DESTINATION "${_INSTALLPATH}")

            message(STATUS "${_LANG} bindings configured!")

        else(PHYSFS_BUILD_${_UPPERLANG})

            message(STATUS "Couldn't figure out ${_LANG} configuration. Skipping ${_LANG} bindings.")

        endif(PHYSFS_BUILD_${_UPPERLANG})

    endmacro(CONFIGURE_SWIG_BINDING)

    macro(ADD_SCRIPT_BINDING_OPTION _VAR _LANG _DEFVAL)

        set(BUILDSWIGVAL ${_DEFVAL})

        if(NOT PHYSFS_BUILD_SWIG)

            set(BUILDSWIGVAL false)

        endif(NOT PHYSFS_BUILD_SWIG)

        option(${_VAR} "Build ${_LANG} bindings." ${BUILDSWIGVAL})

        mark_as_advanced(${_VAR})

    endmacro(ADD_SCRIPT_BINDING_OPTION)

    ADD_SCRIPT_BINDING_OPTION(PHYSFS_BUILD_PERL "Perl" true)

    ADD_SCRIPT_BINDING_OPTION(PHYSFS_BUILD_RUBY "Ruby" true)

endif(NOT SWIG)

if(PHYSFS_BUILD_PERL)

    message(STATUS "Configuring Perl bindings...")

    find_program(PERL perl DOC "Path to perl command line app: http://perl.org/")

    if(NOT PERL)

        message(STATUS "Perl not found. You won't be able to build perl bindings.")

        set(PHYSFS_BUILD_PERL false)

    endif(NOT PERL)

    mark_as_advanced(PERL)

    macro(GET_PERL_CONFIG _KEY _VALUE)

        if(PHYSFS_BUILD_PERL)

            message(STATUS "Figuring out perl config value '${_KEY}' ...")

            execute_process(

                COMMAND ${PERL} -w -e "use Config; print \$Config{${_KEY}};"

                RESULT_VARIABLE GET_PERL_CONFIG_RC

                OUTPUT_VARIABLE ${_VALUE}

            )

            if(NOT GET_PERL_CONFIG_RC EQUAL 0)

                message(STATUS "Perl executable ('${PERL}') reported failure: ${GET_PERL_CONFIG_RC}")

                set(PHYSFS_BUILD_PERL false)

            endif(NOT GET_PERL_CONFIG_RC EQUAL 0)

            if(NOT ${_VALUE})

                message(STATUS "Perl executable ('${PERL}') didn't have a value for '${_KEY}'")

                set(PHYSFS_BUILD_PERL false)

            endif(NOT ${_VALUE})

            if(PHYSFS_BUILD_PERL)

                message(STATUS "Perl says: '${${_VALUE}}'.")

            endif(PHYSFS_BUILD_PERL)

        endif(PHYSFS_BUILD_PERL)

    endmacro(GET_PERL_CONFIG)

    # !!! FIXME: installsitearch might be the wrong location.

    GET_PERL_CONFIG("archlibexp" PERL_INCLUDE_PATH)

    GET_PERL_CONFIG("ccflags" PERL_CCFLAGS)

    GET_PERL_CONFIG("ldflags" PERL_LDFLAGS)

    GET_PERL_CONFIG("installsitearch" PERL_INSTALL_PATH)

    # !!! FIXME: this test for Mac OS X is wrong.

    if(MACOSX)

        GET_PERL_CONFIG("libperl" PERL_LIBPERL)

        set(TMPLIBPERL "${PERL_LIBPERL}")

        string(REGEX REPLACE "^lib" "" TMPLIBPERL "${TMPLIBPERL}")

        string(REGEX REPLACE "\\.so$" "" TMPLIBPERL "${TMPLIBPERL}")

        string(REGEX REPLACE "\\.dylib$" "" TMPLIBPERL "${TMPLIBPERL}")

        string(REGEX REPLACE "\\.dll$" "" TMPLIBPERL "${TMPLIBPERL}")

        if(NOT "${TMPLIBPERL}" STREQUAL "${PERL_LIBPERL}")

            message(STATUS "Stripped '${PERL_LIBPERL}' down to '${TMPLIBPERL}'.")

            set(PERL_LIBPERL "${TMPLIBPERL}")

        endif(NOT "${TMPLIBPERL}" STREQUAL "${PERL_LIBPERL}")

        set(PERL_LIBPERL "-l${PERL_LIBPERL}")

    endif(MACOSX)

    CONFIGURE_SWIG_BINDING(Perl "${PERL_INSTALL_PATH}" "${SWIG_OUTPUT_DIR}/perl/physfs.pm" "\"-I${PERL_INCLUDE_PATH}/CORE\" ${PERL_CCFLAGS} -w" "\"-L${PERL_INCLUDE_PATH}/CORE\" ${PERL_LIBPERL} ${PERL_LDFLAGS}")

    install(FILES "${SWIG_OUTPUT_DIR}/perl/physfs.pm" DESTINATION "${PERL_INSTALL_PATH}")

    install(

        FILES test/test_physfs.pl

        DESTINATION bin

        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE

                    GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE

    )

endif(PHYSFS_BUILD_PERL)

# !!! FIXME: lots of cut-and-paste from perl bindings.

if(PHYSFS_BUILD_RUBY)

    message(STATUS "Configuring Ruby bindings...")

    find_program(RUBY ruby DOC "Path to ruby command line app: http://ruby-lang.org/")

    if(NOT RUBY)

        message(STATUS "Ruby not found. You won't be able to build ruby bindings.")

        set(PHYSFS_BUILD_RUBY FALSE)

    endif(NOT RUBY)

    mark_as_advanced(RUBY)

    macro(GET_RUBY_CONFIG _KEY _VALUE)

        if(PHYSFS_BUILD_RUBY)

            message(STATUS "Figuring out ruby config value '${_KEY}' ...")

            execute_process(

                COMMAND ${RUBY} -e "require 'rbconfig'; puts RbConfig::CONFIG['${_KEY}'];"

                RESULT_VARIABLE GET_RUBY_CONFIG_RC

                OUTPUT_VARIABLE ${_VALUE}

                OUTPUT_STRIP_TRAILING_WHITESPACE

            )

            if(NOT GET_RUBY_CONFIG_RC EQUAL 0)

                message(STATUS "Ruby executable ('${RUBY}') reported failure: ${GET_RUBY_CONFIG_RC}")

                set(PHYSFS_BUILD_RUBY FALSE)

            endif(NOT GET_RUBY_CONFIG_RC EQUAL 0)

            if(NOT ${_VALUE})

                message(STATUS "Ruby executable ('${RUBY}') didn't have a value for '${_KEY}'")

                set(PHYSFS_BUILD_RUBY FALSE)

            endif(NOT ${_VALUE})

            if(PHYSFS_BUILD_RUBY)

                message(STATUS "Ruby says: '${${_VALUE}}'.")

            endif(PHYSFS_BUILD_RUBY)

        endif(PHYSFS_BUILD_RUBY)

    endmacro(GET_RUBY_CONFIG)

    GET_RUBY_CONFIG("archdir" RUBY_INCLUDE_PATH)

    GET_RUBY_CONFIG("CFLAGS" RUBY_CCFLAGS)

    GET_RUBY_CONFIG("LDFLAGS" RUBY_LDFLAGS)

    GET_RUBY_CONFIG("sitearchdir" RUBY_INSTALL_PATH)

    GET_RUBY_CONFIG("LIBRUBYARG_SHARED" RUBY_LIBRUBY)

    GET_RUBY_CONFIG("libdir" RUBY_LIBDIR)