#from http://www.libsdl.org/ #this imports variables here PackageSetup() if(WIN32) # message(FATAL_ERROR "package ${PACKAGE} not currently available for windows") ExternalProject_Add( ${PACKAGE} ${Package_std_dirs} URL http://www.libsdl.org/release/SDL-1.2.14.tar.gz URL_MD5 e52086d1b508fa0b76c52ee30b55bec4 INSTALL_COMMAND "" CONFIGURE_COMMAND "" BUILD_COMMAND "" ) else() #configure based install set(Package_PkgConfig ON) set(Package_configure_flags "") PackageUnixAddCmakeVarsToConfigureFlags() PackageUnixConfigureSimpleAdd( http://www.libsdl.org/release/SDL-1.2.14.tar.gz ) endif()