Keeps the auxiliary, non-executable script files out of /usr/bin, and
avoids calling uname every time git-flow runs.

--- a/git-flow
+++ b/git-flow
@@ -41,41 +41,9 @@
 	set -x
 fi
 
-# Setup the GITFLOW_DIR for different operating systems.
-# This is mostly to make sure that we get the correct directory when the
-# git-flow file is a symbolic link
-case $(uname -s) in
-Linux)
-	export GITFLOW_DIR=$(dirname "$(readlink -e "$0")")
-	;;
-FreeBSD|OpenBSD|NetBSD)
-	export FLAGS_GETOPT_CMD='/usr/local/bin/getopt'
-	export GITFLOW_DIR=$(dirname "$(realpath "$0")")
-	;;
-Darwin)
-	PRG="$0"
-	while [ -h "$PRG" ]; do
-		link=$(readlink "$PRG")
-		if expr "$link" : '/.*' > /dev/null; then
-			PRG="$link"
-		else
-			PRG="$(dirname "$PRG")/$link"
-		fi
-	done
-	export GITFLOW_DIR=$(dirname "$PRG")
-	;;
-*MINGW*)
-	export GITFLOW_DIR=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
-	pwd () {
-		builtin pwd -W
-	}
-	;;
-*)
-	# The sed expression here replaces all backslashes by forward slashes.
-	# This helps our Windows users, while not bothering our Unix users.)
-	export GITFLOW_DIR=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
-	;;
-esac
+# Setup GITFLOW_DIR
+GITFLOW_DIR="@PREFIX@/libexec/git-flow"
+export GITFLOW_DIR
 
 # Extra environment settings
 if [ -f ~/.gitflow_export ]; then
--- a/Makefile
+++ b/Makefile
@@ -30,6 +30,7 @@
 
 datarootdir=$(prefix)/share
 docdir=$(datarootdir)/doc/gitflow
+scriptdir=$(prefix)/libexec/git-flow
 # files that need mode 755
 EXEC_FILES=git-flow
 
@@ -55,9 +56,10 @@
 
 install:
 	install -d -m 0755 $(prefix)/bin
+	install -d -m 0755 $(scriptdir)
 	install -d -m 0755 $(docdir)/hooks
 	install -m 0755 $(EXEC_FILES) $(prefix)/bin
-	install -m 0644 $(SCRIPT_FILES) $(prefix)/bin
+	install -m 0644 $(SCRIPT_FILES) $(scriptdir)
 	install -m 0644 $(HOOK_FILES) $(docdir)/hooks
 
 uninstall: