find_package(PkgConfig) if (PKG_CONFIG_FOUND) pkg_check_modules(PIXMAN pixman-1) else() find_path(PIXMAN_INCLUDE_DIRS NAMES pixman.h PATH_SUFFIXES pixman-1) find_library(PIXMAN_LIBRARIES NAMES pixman-1) find_package_handle_standard_args(PIXMAN DEFAULT_MSG PIXMAN_LIBRARIES PIXMAN_INCLUDE_DIRS) endif()