diff --git a/install.sh b/install.sh
index 9b22c49..b1f656d 100755
--- a/install.sh
+++ b/install.sh
@@ -2,15 +2,22 @@
 
 set -e
 
-DESTDIR=$1
-BINDIR=$DESTDIR/usr/bin
-LIBDIR=$DESTDIR/usr/share/grc
-MANDIR=$DESTDIR/usr/share/man/man1
-CONFDIR=$DESTDIR/etc
+PREFIX=$1
+if [ -z $PREFIX ]; then
+  PREFIX=/usr/local
+fi
+
+BINDIR=$PREFIX/bin
+LIBDIR=$PREFIX/share/grc
+MANDIR=$PREFIX/share/man
+CONFDIR=/etc
+PROFILEDIR=$CONFDIR/profile.d
 
 mkdir -p $BINDIR || true
 cp -fv grc grcat $BINDIR
 mkdir -p $LIBDIR || true
 cp -fv conf.* $LIBDIR
-mkdir -p $CONFDIR || true
+cp -fv $MANDIR/man1/grc.1 $MANDIR
+cp -fv $MANDIR/man1/grcat.1 $MANDIR
 cp -fv grc.conf $CONFDIR
+cp -fv grc.bashrc $PROFILEDIR