Script might well override a static map, but can't risk it not doing it, and preview completely failing. Better to just not try it for static maps. Some script cfg might help. Could also avoid unnnecessary preview regenerations even if the script was doing nothing at all.
# Find ffmpeg/libav libraries (libavcodec, libavformat and libavutil)
# Once done this will define
#
# LIBAV_FOUND - system has libavcodec, libavformat, libavutil
# LIBAV_INCLUDE_DIR - libav include directories
# LIBAV_LIBRARIES - libav libraries (libavcodec, libavformat, libavutil)
#
# LIBAVCODEC_LIBRARY - libavcodec library
# LIBAVCODEC_INCLUDE_DIR - libavcodec include directory
# LIBAVFORMAT_LIBRARY - libavformat library
# LIBAVUTIL_LIBRARY - libavutil library
#
# Copyright (c) 2008 Andreas Schneider <mail@cynapses.org>
# Modified for other libraries by Lasse Kärkkäinen <tronic>
# Modified for Hedgewars by Stepik777
# Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
#
# Redistribution and use is allowed according to the terms of the New
# BSD license.
#
include(FindPackageHandleStandardArgs)
# use pkg-config to get the directories and then use these values
# in the FIND_PATH() and FIND_LIBRARY() calls
find_package(PkgConfig)
if(PKG_CONFIG_FOUND)
if(NOT LIBAVCODEC_INCLUDE_DIR OR NOT LIBAVCODEC_LIBRARY)
pkg_check_modules(_LIBAV_AVCODEC libavcodec)
endif()
if(NOT LIBAVFORMAT_LIBRARY)
pkg_check_modules(_LIBAV_AVFORMAT libavformat)
endif()
if(NOT LIBAVUTIL_LIBRARY)
pkg_check_modules(_LIBAV_AVUTIL libavutil)
endif()
endif(PKG_CONFIG_FOUND)
find_path(LIBAVCODEC_INCLUDE_DIR
NAMES libavcodec/avcodec.h
PATHS ${_LIBAV_AVCODEC_INCLUDE_DIRS} #pkg-config
/usr/include /usr/local/include #system level
/opt/local/include /sw/include #macports & fink
PATH_SUFFIXES libav ffmpeg
)
#TODO: add other include paths
find_library(LIBAVCODEC_LIBRARY
NAMES avcodec
PATHS ${_LIBAV_AVCODEC_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_library(LIBAVFORMAT_LIBRARY
NAMES avformat
PATHS ${_LIBAV_AVFORMAT_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_library(LIBAVUTIL_LIBRARY
NAMES avutil
PATHS ${_LIBAV_AVUTIL_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_package_handle_standard_args(LIBAV DEFAULT_MSG LIBAVCODEC_LIBRARY
LIBAVCODEC_INCLUDE_DIR
LIBAVFORMAT_LIBRARY
LIBAVUTIL_LIBRARY
)
set(LIBAV_INCLUDE_DIR ${LIBAVCODEC_INCLUDE_DIR}
#TODO: add other include paths
)
set(LIBAV_LIBRARIES ${LIBAVCODEC_LIBRARY}
${LIBAVFORMAT_LIBRARY}
${LIBAVUTIL_LIBRARY}
)
mark_as_advanced(LIBAV_INCLUDE_DIR
LIBAV_LIBRARIES
LIBAVCODEC_LIBRARY
LIBAVCODEC_INCLUDE_DIR
LIBAVFORMAT_LIBRARY
LIBAVUTIL_LIBRARY)