Add guard to prevent eekboard/eekboard-*.h from being included directly.

eekboard/Makefile.am

@@ -27,7 +27,7 @@ libeekboard_sources =				\
 	eekboard-context.c
 
 libeekboard_la_SOURCES = $(libeekboard_sources)
-libeekboard_la_CFLAGS = -I$(top_srcdir) $(GIO2_CFLAGS)
+libeekboard_la_CFLAGS = -DEEKBOARD_COMPILATION=1 -I$(top_srcdir) $(GIO2_CFLAGS)
 libeekboard_la_LIBADD = $(top_builddir)/eek/libeek.la $(GIO2_LIBS)
 
 eekboarddir = $(includedir)/eekboard-$(EEK_API_VERSION)/eekboard

eekboard/eekboard-context.h

@@ -15,6 +15,11 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
+#if !defined(__EEKBOARD_H_INSIDE__) && !defined(EEKBOARD_COMPILATION)
+#error "Only <eekboard/eekboard.h> can be included directly."
+#endif
+
 #ifndef EEKBOARD_CONTEXT_H
 #define EEKBOARD_CONTEXT_H 1
 

eekboard/eekboard-eekboard.h

@@ -15,6 +15,11 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
+#if !defined(__EEKBOARD_H_INSIDE__) && !defined(EEKBOARD_COMPILATION)
+#error "Only <eekboard/eekboard.h> can be included directly."
+#endif
+
 #ifndef EEKBOARD_EEKBOARD_H
 #define EEKBOARD_EEKBOARD_H 1
 

eekboard/eekboard.h

@@ -18,6 +18,8 @@
 #ifndef EEKBOARD_H
 #define EEKBOARD_H 1
 
+#define __EEKBOARD_H_INSIDE__ 1
+
 #include "eekboard/eekboard-eekboard.h"
 #include "eekboard/eekboard-context.h"