diff --git a/fc-case/Makefile.am b/fc-case/Makefile.am
index ad5dc74..6914824 100644
--- a/fc-case/Makefile.am
+++ b/fc-case/Makefile.am
@@ -23,7 +23,7 @@
 # PERFORMANCE OF THIS SOFTWARE.
 #
 
-INCLUDES=-I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
+INCLUDES=-I${top_builddir}/src -I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
 
 TMPL=fccase.tmpl.h
 STMPL=${top_srcdir}/fc-case/${TMPL}
diff --git a/fc-glyphname/Makefile.am b/fc-glyphname/Makefile.am
index 697b5c3..fdba146 100644
--- a/fc-glyphname/Makefile.am
+++ b/fc-glyphname/Makefile.am
@@ -23,7 +23,7 @@
 # PERFORMANCE OF THIS SOFTWARE.
 #
 
-INCLUDES=-I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
+INCLUDES=-I${top_builddir}/src -I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
 
 TMPL=fcglyphname.tmpl.h
 STMPL=${top_srcdir}/fc-glyphname/${TMPL}
diff --git a/fc-lang/Makefile.am b/fc-lang/Makefile.am
index d2eca5b..5c2d1bf 100644
--- a/fc-lang/Makefile.am
+++ b/fc-lang/Makefile.am
@@ -23,7 +23,7 @@
 # PERFORMANCE OF THIS SOFTWARE.
 #
 
-INCLUDES=-I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
+INCLUDES=-I${top_builddir}/src -I${top_srcdir}/src -I${top_srcdir} $(WARN_CFLAGS)
 
 TMPL=fclang.tmpl.h
 STMPL=${top_srcdir}/fc-lang/fclang.tmpl.h