diff --git a/cfg/gtk.cfg b/cfg/gtk.cfg
index 6724f716f..f298758ef 100644
--- a/cfg/gtk.cfg
+++ b/cfg/gtk.cfg
@@ -5,6 +5,8 @@
   <define name="g_return_val_if_fail(expr, val)" value="do{if(!(expr)){return val;}}while(0)"/>
   <define name="g_return_if_reached()" value="do{return;}while(0)"/>
   <define name="g_return_val_if_reached(val)" value="do{return val;}while(0)"/>
+  <define name="G_LIKELY(expr)" value="(expr)"/>
+  <define name="G_UNLIKELY(expr)" value="(expr)"/>
   <memory>
     <alloc init="true">g_thread_new</alloc>
     <alloc init="true">g_thread_try_new</alloc>
diff --git a/test/cfg/gtk.c b/test/cfg/gtk.c
new file mode 100644
index 000000000..9ef0fd9e9
--- /dev/null
+++ b/test/cfg/gtk.c
@@ -0,0 +1,22 @@
+
+// Test library configuration for gtk.cfg
+//
+// Usage:
+// $ cppcheck --check-library --enable=information --inconclusive --error-exitcode=1 --suppress=missingIncludeSystem --inline-suppr --library=gtk test/cfg/gtk.cpp
+// =>
+// No warnings about bad library configuration, unmatched suppressions, etc. exitcode=0
+//
+
+#include <gtk/gtk.h>
+
+void validCode(int argInt)
+{
+    // if G_UNLIKELY is not defined this results in a syntax error
+    if G_UNLIKELY(argInt == 1) {
+    } else if (G_UNLIKELY(argInt == 2)) {
+    }
+
+    if G_LIKELY(argInt == 0) {
+    } else if (G_LIKELY(argInt == -1)) {
+    }
+}
diff --git a/test/cfg/runtests.sh b/test/cfg/runtests.sh
index fa5348616..b86a11df5 100755
--- a/test/cfg/runtests.sh
+++ b/test/cfg/runtests.sh
@@ -64,3 +64,36 @@ else
     fi
 fi
 ${CPPCHECK} ${CPPCHECK_OPT} --inconclusive --library=wxwidgets -f ${DIR}wxwidgets.cpp
+
+# gtk.c
+set +e
+pkg-config --version
+PKGCONFIG_RETURNCODE=$?
+set -e
+if [ $PKGCONFIG_RETURNCODE -ne 0 ]; then
+    echo "pkg-config needed to retrieve GTK+ configuration is not available, skipping syntax check."
+else
+    set +e
+    GTKCONFIG=$(pkg-config --cflags gtk+-3.0)
+    GTKCONFIG_RETURNCODE=$?
+    set -e
+    if [ $GTKCONFIG_RETURNCODE -ne 0 ]; then
+        set +e
+        GTKCONFIG=$(pkg-config --cflags gtk+-2.0)
+        GTKCONFIG_RETURNCODE=$?
+        set -e
+    fi
+    if [ $GTKCONFIG_RETURNCODE -eq 0 ]; then
+        set +e
+        echo -e "#include <gtk/gtk.h>" | ${CC} ${CC_OPT} ${GTKCONFIG} -x c -
+        GTKCHECK_RETURNCODE=$?
+        set -e
+        if [ $GTKCHECK_RETURNCODE -ne 0 ]; then
+            echo "GTK+ not completely present or not working, skipping syntax check with ${CXX}."
+        else
+            echo "GTK+ found and working, checking syntax with ${CXX} now."
+            ${CC} ${CC_OPT} ${GTKCONFIG} ${DIR}gtk.c
+        fi
+    fi
+fi
+${CPPCHECK} ${CPPCHECK_OPT} --inconclusive --library=gtk -f ${DIR}gtk.c