diff --git a/compress/Makefile b/compress/Makefile
index 3f90948..c3d8da4 100644
--- a/compress/Makefile
+++ b/compress/Makefile
@@ -2,7 +2,7 @@
 
 CC ?=		cc
 CFLAGS ?=	-O2 -pipe
-CFLAGS +=	-I../libopenbsd -include openbsd.h
+CFLAGS +=	-I../libopenbsd -include openbsd.h -fcommon
 
 LIBS =	../libz/libz.a ../libopenbsd/libopenbsd.a
 
diff --git a/cvs/Makefile b/cvs/Makefile
index 43d4c61..6228386 100644
--- a/cvs/Makefile
+++ b/cvs/Makefile
@@ -2,7 +2,7 @@
 
 CC ?=		cc
 CFLAGS ?=	-O2 -pipe
-CFLAGS +=	-I../libopenbsd -include openbsd.h -I. -D_GNU_SOURCE
+CFLAGS +=	-I../libopenbsd -include openbsd.h -I. -D_GNU_SOURCE -fcommon
 
 LIBS =	../libopenbsd/libopenbsd.a
 
diff --git a/indent/Makefile b/indent/Makefile
index 4f6070e..7b23860 100644
--- a/indent/Makefile
+++ b/indent/Makefile
@@ -2,7 +2,7 @@
 
 CC ?=		cc
 CFLAGS ?=	-O2 -pipe
-CFLAGS +=	-I../libopenbsd -include openbsd.h
+CFLAGS +=	-I../libopenbsd -include openbsd.h -fcommon
 
 LIBS =	../libopenbsd/libopenbsd.a
 
diff --git a/rcs/Makefile b/rcs/Makefile
index b28d03f..857fea1 100644
--- a/rcs/Makefile
+++ b/rcs/Makefile
@@ -2,7 +2,7 @@
 
 CC ?=		cc
 CFLAGS ?=	-O2 -pipe
-CFLAGS +=	-I../libopenbsd -include openbsd.h -I. -D_GNU_SOURCE
+CFLAGS +=	-I../libopenbsd -include openbsd.h -I. -D_GNU_SOURCE -fcommon
 
 LIBS =	../libopenbsd/libopenbsd.a