CMake: set project languages to C
@@ -70,7 +70,7 @@ IF (NOT UPNP_VERSION_STRING)
ENDFOREACH (MACROFILE ${MACROFILES})
ENDIF (NOT UPNP_VERSION_STRING)
-PROJECT (UPNP VERSION ${UPNP_VERSION_STRING})
+PROJECT (UPNP VERSION ${UPNP_VERSION_STRING} LANGUAGES C)
INCLUDE (GNUInstallDirs)
IF (WIN32)
