Include files will not anymore installed in the system with an make install.

include/Makefile.am

@@ -6,7 +6,7 @@
 
 bomberclone_includedir = $(pkgincludedir)
 
-bomberclone_include_DATA = \
+bomberclone_include = \
 	basic.h \
 	bomberclone.h \
 	chat.h \
@@ -28,4 +28,4 @@ bomberclone_include_DATA = \
 	bomb.h \
 	single.h
 
-EXTRA_DIST = $(bomberclone_include_DATA)
+noinst_HEADERS = $(bomberclone_include)