diff --git a/ValaBinCommonRules.cmake b/ValaBinCommonRules.cmake
index 6e6aa19..d9a4e11 100644
--- a/ValaBinCommonRules.cmake
+++ b/ValaBinCommonRules.cmake
@@ -12,7 +12,9 @@ VALA_PRECOMPILE (VALA_C ${BinSources}
                  GENERATE_VAPI
                  GENERATE_HEADER
                 )
-PKG_CHECK_MODULES (PKGS REQUIRED ${BinPkgModules})
+IF (NOT "${LibPkgModules}" STREQUAL "")
+  PKG_CHECK_MODULES (PKGS REQUIRED ${LibPkgModules})
+ENDIF ()
 INCLUDE_DIRECTORIES (${PKGS_INCLUDE_DIRS} ${CMAKE_BINARY_DIR}/po)
 ADD_EXECUTABLE (${BinName} ${VALA_C} ${BinExtraSources})
 ADD_DEFINITIONS (-DGETTEXT_PACKAGE="${PROJECT_LOWERCASE_NAME}-${MAJOR}")
diff --git a/ValaLibCommonRules.cmake b/ValaLibCommonRules.cmake
index 45ed3dd..709554f 100644
--- a/ValaLibCommonRules.cmake
+++ b/ValaLibCommonRules.cmake
@@ -22,7 +22,9 @@ VALA_PRECOMPILE (VALA_C ${LibSources}
                  GENERATE_VAPI
                  GENERATE_HEADER ${generate_header}
                 )
-PKG_CHECK_MODULES (PKGS REQUIRED ${LibPkgModules})
+IF (NOT "${LibPkgModules}" STREQUAL "")
+  PKG_CHECK_MODULES (PKGS REQUIRED ${LibPkgModules})
+ENDIF ()
 INCLUDE_DIRECTORIES (${PKGS_INCLUDE_DIRS} ${CMAKE_BINARY_DIR}/po)
 ADD_LIBRARY (${LibName} SHARED ${VALA_C} ${LibExtraSources})
 ADD_DEFINITIONS (-DGETTEXT_PACKAGE="${PROJECT_LOWERCASE_NAME}-${MAJOR}")