[kdepim] ConfigureChecks: cleanup GPGME_INCLUDE_DIRS and GPGME_LIBRARIES only if they really contain something

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1223930 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

ConfigureChecks.cmake

@@ -42,8 +42,12 @@ if( BUILD_LIBKDENETWORK OR BUILD_CERTMANAGER OR BUILD_KMAIL OR BUILD_KADDRESSBOO
   __run_gpgme_config( libs GPGME_LIBRARIES )
 
   # cleanup
-  string( REGEX REPLACE "(^| )-I" ";" GPGME_INCLUDE_DIRS ${GPGME_INCLUDE_DIRS} )
-  string( REGEX REPLACE "(^| )-l" ";" GPGME_LIBRARIES ${GPGME_LIBRARIES} )
+  if( GPGME_INCLUDE_DIRS )
+    string( REGEX REPLACE "(^| )-I" ";" GPGME_INCLUDE_DIRS "${GPGME_INCLUDE_DIRS}" )
+  endif( )
+  if( GPGME_LIBRARIES )
+    string( REGEX REPLACE "(^| )-l" ";" GPGME_LIBRARIES "${GPGME_LIBRARIES}" )
+  endif( )
 
   # assuming that all newer system have gpgme >= 0.4
   set( HAVE_GPGME_0_4_BRANCH 1 CACHE INTERNAL "" )