FS-5512 --resolve ; clean up PostgreSQL libpq client detection in configure

Clean up the libpq autodection and make sure it functionswith both pg_config and pkg-config.

if you are installing into a non-FHS standard location such as what happens with RPMs from the Postgres yum repo, you will need to make sure pkg-config can fild the libpq.pc file.
example: export PKG_CONFIG_PATH=/usr/pgsql-9.3/lib/pkgconfig

you may also want to make sure your path can find pg_config
example: export PATH=/usr/pgsql-9.3/bin:$PATH

configure.in

@@ -1,4 +1,5 @@
 #                                               -*- Autoconf -*-
+>>>>>>> 1a85246... svn has been long retired
 # Process this file with autoconf to produce a configure script.
 
 # Must change all of the below together
@@ -425,39 +426,47 @@ AC_ARG_ENABLE(core-pgsql-pkgconfig,
 if test x"$enable_core_pgsql_support" = x"yes" ; then
   AC_PATH_PROG([PG_CONFIG], [pg_config], [no])
   AC_PATH_PROG([PKG_CONFIG], [pkg-config], [no])
-  if test "$PG_CONFIG" = "no"; then
-    AC_MSG_RESULT([no])
-    AC_MSG_FAILURE([Unabled to find pg_config in PATH. Is PostgreSQL installed?])
-  else
     if test "$PKG_CONFIG" = "no" \
        || test x"$enable_core_pgsql_pkgconfig" = x"no" \
        || ! pkg-config libpq; then
-      AC_MSG_CHECKING([for PostgreSQL libraries])
+	if test "$PG_CONFIG" != "no"; then
-      POSTGRESQL_CXXFLAGS="`$PG_CONFIG --cppflags` -I`$PG_CONFIG --includedir`"
+            AC_MSG_CHECKING([for PostgreSQL libraries via pg_config])
-      POSTGRESQL_LDFLAGS="`$PG_CONFIG --ldflags|sed 's/ -Wl,--as-needed//g'` -L`$PG_CONFIG --libdir` -lpq"
+            POSTGRESQL_CFLAGS="-I`$PG_CONFIG --includedir`"
-      POSTGRESQL_VERSION=`$PG_CONFIG --version | sed -e 's#PostgreSQL ##'`
+            POSTGRESQL_LIBDIR="-L`$PG_CONFIG --libdir`"
-      POSTGRESQL_MAJOR_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL ([0-9]+).[0-9]+.?[0-9]+?#\1#'`
+            POSTGRESQL_LDFLAGS="-L`$PG_CONFIG --libdir` -lpq"
-      POSTGRESQL_MINOR_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL [0-9]+.([0-9]+).?[0-9]+?#\1#'`
+            POSTGRESQL_VERSION=`$PG_CONFIG --version | sed -e 's#PostgreSQL ##'`
-      POSTGRESQL_PATCH_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL [0-9]+.[0-9]+.?([0-9]+)?#\1#'`
+            POSTGRESQL_MAJOR_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL ([0-9]+).[0-9]+.?[0-9]+?#\1#'`
+            POSTGRESQL_MINOR_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL [0-9]+.([0-9]+).?[0-9]+?#\1#'`
+            POSTGRESQL_PATCH_VERSION=`$PG_CONFIG --version | sed -e 's/devel//' | sed -re 's#PostgreSQL [0-9]+.[0-9]+.?([0-9]+)?#\1#'`	
+        else
+            AC_MSG_ERROR([no usable pkg-config or pg_config; please install libpq devel package or equivalent])
+        fi
     else
-      AC_MSG_CHECKING([for PostgreSQL libraries])
+      AC_MSG_CHECKING([for PostgreSQL libraries via pkg_config])
-      POSTGRESQL_CXXFLAGS="`$PKG_CONFIG --cflags libpq`"
+      POSTGRESQL_CFLAGS="`$PKG_CONFIG --cflags libpq`"
+      POSTGRESQL_LIBDIR="`$PKG_CONFIG libpq --libs-only-L`"
       POSTGRESQL_LDFLAGS="`$PKG_CONFIG --libs libpq`"
       POSTGRESQL_VERSION="`$PKG_CONFIG --modversion libpq`"
       POSTGRESQL_MAJOR_VERSION="`echo $POSTGRESQL_VERSION | cut -d. -f1`"
       POSTGRESQL_MINOR_VERSION="`echo $POSTGRESQL_VERSION | cut -d. -f2`"
       POSTGRESQL_PATCH_VERSION="`echo $POSTGRESQL_VERSION | cut -d. -f3`"
     fi
+    save_LIBS="$LIBS"
+    LIBS="$POSTGRESQL_LIBDIR $LIBS"
+    AC_MSG_RESULT([$POSTGRESQL_LIBDIR])
+
     AC_DEFINE([SWITCH_HAVE_PGSQL], [1], [Define to 1 if PostgreSQL libraries are available])
     AC_DEFINE_UNQUOTED([POSTGRESQL_VERSION], "${POSTGRESQL_VERSION}", [Specifies the version of PostgreSQL we are linking against])
     AC_DEFINE_UNQUOTED([POSTGRESQL_MAJOR_VERSION], ${POSTGRESQL_MAJOR_VERSION}, [Specifies the version of PostgreSQL we are linking against])
     AC_DEFINE_UNQUOTED([POSTGRESQL_MINOR_VERSION], ${POSTGRESQL_MINOR_VERSION}, [Specifies the version of PostgreSQL we are linking against])
     AC_DEFINE_UNQUOTED([POSTGRESQL_PATCH_VERSION], ${POSTGRESQL_PATCH_VERSION}, [Specifies the version of PostgreSQL we are linking against])
+
     AC_CHECK_LIB([pq], [PQgetvalue],, AC_MSG_ERROR([no usable libpq; please install PostgreSQL devel package or equivalent]))
     AC_MSG_RESULT([yes])
-    SWITCH_AM_CXXFLAGS="$POSTGRESQL_CXXFLAGS $SWITCH_AM_CXXFLAGS"
+    SWITCH_AM_CXXFLAGS="$POSTGRESQL_CFLAGS $SWITCH_AM_CXXFLAGS"
     SWITCH_AM_LDFLAGS="$POSTGRESQL_LDFLAGS $SWITCH_AM_LDFLAGS"
-  fi
+
+    LIBS="$save_LIBS"
 fi
 
 AC_ARG_ENABLE(deprecated-core-db-events,