--- /dev/null
+cat > 'test.c' <<EOF
+#include <stdio.h>
+#include <mynumber.h>
+int main()
+{
+ printf("NUMBER is %d\n", NUMBER);
+ return 0;
+}
+EOF
+cat > 'Makefile.omk' <<EOF
+bin_PROGRAMS = test
+
+test_SOURCES = test.c
+
+INCLUDES = -I$(SOURCES_DIR)/inc
+EOF
+mkdir 'inc'
+echo '#define NUMBER 456' > 'inc/mynumber.h'