From 80bb6a71efc4a34d2d1c1c1f6a07b5ef73652474 Mon Sep 17 00:00:00 2001
From: Paul Ramsey <pramsey@cleverelephant.ca>
Date: Tue, 28 Feb 2012 18:50:18 +0000
Subject: [PATCH] Make our --prefix policy crystal clear

git-svn-id: http://svn.osgeo.org/postgis/trunk@9333 b70326c6-7e19-0410-871a-916f4a2858ee
---
 configure.ac | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/configure.ac b/configure.ac
index b37bf745d..3789b41f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -360,6 +360,10 @@ PGSQL_MINOR_VERSION=`$PGCONFIG --version | sed 's/[[A-Za-z ]]*//' | cut -d. -f2
 PGSQL_FULL_VERSION=`$PGCONFIG --version`
 POSTGIS_PGSQL_VERSION="$PGSQL_MAJOR_VERSION$PGSQL_MINOR_VERSION"
 
+PGSQL_PKGLIBDIR=`$PGCONFIG --pkglibdir`
+PGSQL_LIBDIR=`$PGCONFIG --libdir`
+PGSQL_SHAREDIR=`$PGCONFIG --sharedir`
+
 AC_MSG_RESULT([checking PostgreSQL version... $PGSQL_FULL_VERSION])
 dnl Ensure that we are using PostgreSQL >= 8.3
 if test ! "$PGSQL_MAJOR_VERSION" -ge 8; then
@@ -442,6 +446,26 @@ AC_DEFINE_UNQUOTED([POSTGIS_PGSQL_VERSION], [$POSTGIS_PGSQL_VERSION], [PostgreSQ
 AC_SUBST([POSTGIS_PGSQL_VERSION])
 
 
+dnl ===========================================================================
+dnl Explain our prefix policy if necessary.
+dnl ===========================================================================
+
+if test "$prefix" != "NONE"; then
+  AC_MSG_RESULT([----------------------------------------------------------------------])
+  AC_MSG_RESULT([  You have set the --prefix to '$prefix'. Unfortunately the PostGIS   ])
+  AC_MSG_RESULT([  build system can only install into the directories used by the      ])
+  AC_MSG_RESULT([  PostgreSQL build you are compiling against, the one that supplied   ])
+  AC_MSG_RESULT([  the pg_config we detected: $PGCONFIG ])
+  AC_MSG_RESULT([  Based on that script we will be installing:   ])
+  AC_MSG_RESULT([    * postgis shared library in $PGSQL_LIBDIR ])
+  AC_MSG_RESULT([    * postgis SQL files in $PGSQL_SHAREDIR/contrib/postgis-$POSTGIS_MAJOR_VERSION.$POSTGIS_MINOR_VERSION ])
+  AC_MSG_RESULT([    * postgis executables in $PGSQL_BINDIR ])
+  AC_MSG_RESULT([  Please try again without a --prefix, sorry. ])
+  AC_MSG_RESULT([----------------------------------------------------------------------])
+  AC_MSG_ERROR([])
+fi
+
+
 dnl ===========================================================================
 dnl Detect libxml2 if it is installed
 dnl (needed to GeomFromGML and GeomFromKML functions)
-- 
2.40.0