-execute_process(COMMAND dpkg-parsechangelog -SVersion -l${PROJECT_SOURCE_DIR}/debian/changelog
- OUTPUT_VARIABLE PACKAGE_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
-execute_process(COMMAND dpkg-architecture -qDEB_HOST_ARCH
- OUTPUT_VARIABLE COMMON_ARCH OUTPUT_STRIP_TRAILING_WHITESPACE)
+if (NOT DEFINED COMMON_ARCH)
+ execute_process(COMMAND dpkg-architecture -qDEB_HOST_ARCH
+ OUTPUT_VARIABLE COMMON_ARCH OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()