diff --git a/install.sh b/install.sh
index e228973..a423039 100755
--- a/install.sh
+++ b/install.sh
@@ -23,6 +23,7 @@ set -e
 #
 TOP=`git rev-parse --show-toplevel`
 PLAN9C=$TOP/plan9c;	export PLAN9C
+INSTALLDIR=/usr/local/plan9c
 
 # build dist
 echo "===> building go dist tool"
@@ -57,6 +58,29 @@ else
 	RELFLAGS="-Og -ggdb"
 fi
 
+echo -n "keep local (l) or install system wide (s) in /usr/local/plan0c [L/s]? "
+read ans
+if [ "X$ans" = "Xs" ]; then
+cat <<EOF > Makefile.p9c
+#
+# Builds C programs with plan9 C and link them statically with musl libc on
+# Linux if available, for a fast clean and compact freestanding executable
+# binary.
+#
+CC=${CC}
+
+CFLAGS=		-Wall -Wstrict-prototypes -Wextra -Wunused -Wno-sign-compare
+CFLAGS+=	-Wno-missing-braces -Wno-parentheses -Wno-unknown-pragmas
+CFLAGS+=	-Wno-switch -Wno-comment -Wno-missing-field-initializers
+CFLAGS+=	-Werror -fno-common
+
+CFLAGS+=	$RELFLAGS -pipe -Wuninitialized -fmessage-length=0
+
+CPPFLAGS=	-I ${INSTALLDIR}/include
+
+LDFLAGS=	-static -L ${INSTALLDIR}/lib -lbio -l9
+EOF
+else
 cat <<EOF > Makefile.p9c
 #
 # Builds C programs with plan9 C and link them statically with musl libc on
@@ -76,5 +100,42 @@ CPPFLAGS=	-I ${PLAN9C}/include
 
 LDFLAGS=	-static -L ${PLAN9C}/lib -lbio -l9
 EOF
+fi
+
+if [ "X$ans" = "Xs" ]; then
+	echo "===> installing plan9c into $INSTALLDIR ..."
+	install -d -o root -g bin -m 755 $INSTALLDIR
+	install -d -o root -g bin -m 755 $INSTALLDIR/lib
+	install -m 444 ${PLAN9C}/lib/lib9.a $INSTALLDIR/lib
+	install -m 444 ${PLAN9C}/lib/libbio.a $INSTALLDIR/lib
+	install -m 444 ${PLAN9C}/lib/libcc.a $INSTALLDIR/lib
+	install -m 444 ${PLAN9C}/lib/libgc.a $INSTALLDIR/lib
+	install -m 444 ${PLAN9C}/lib/liblink.a $INSTALLDIR/lib
+	install -d -o root -g bin -m 755 $INSTALLDIR/include
+	install -d -o root -g bin -m 755 $INSTALLDIR/include/plan9
+	install -d -o root -g bin -m 755 $INSTALLDIR/include/plan9/386
+	install -d -o root -g bin -m 755 $INSTALLDIR/include/plan9/amd64
+	install -d -o root -g bin -m 755 $INSTALLDIR/include/plan9/arm
+	install -m 444 ${PLAN9C}/include/ar.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/bio.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/fmt.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/libc.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/link.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/u.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/src/lib9/utf/utf.h $INSTALLDIR/include
+	install -m 444 ${PLAN9C}/include/plan9/bio.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/errno.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/fmt.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/libc.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/link.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/stdarg.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/utf.h $INSTALLDIR/include/plan9
+	install -m 444 ${PLAN9C}/include/plan9/386/u.h $INSTALLDIR/include/plan9/386/u.h
+	install -m 444 ${PLAN9C}/include/plan9/amd64/u.h $INSTALLDIR/include/plan9/amd64/u.h
+	install -m 444 ${PLAN9C}/include/plan9/arm/u.h $INSTALLDIR/include/plan9/arm/u.h
+	install -d -o root -g bin -m 755 $INSTALLDIR/share
+	install -m 444 ${TOP}/README $INSTALLDIR/share
+	install -m 444 ${TOP}/Makefile.p9c $INSTALLDIR/share
+fi
 
 echo ""; echo "Success ! Makefile.p9c ready for use !"