[gthumb] don't use the += operator, which is not supported by all the shells

[Paolo Bacchilega <paobac src gnome org>]

commit 09928cae9cab845ccb1ee07bf23bef527b0f6913
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri Oct 1 09:31:32 2010 +0200

    don't use the += operator, which is not supported by all the shells
    
    [bug #630836]

 configure.ac |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 5410d34..2082202 100644
--- a/configure.ac
+++ b/configure.ac
@@ -66,8 +66,8 @@ AC_ARG_ENABLE(deprecated,
 	      disable_deprecated=yes,
 	      disable_deprecated=no)
 if test x$disable_deprecated = xyes; then
-	CFLAGS+=" -DG_DISABLE_SINGLE_INCLUDES -DGDK_PIXBUF_DISABLE_SINGLE_INCLUDES -DGTK_DISABLE_SINGLE_INCLUDES"
-	CFLAGS+=" -DG_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED"
+	CFLAGS="$CFLAGS -DG_DISABLE_SINGLE_INCLUDES -DGDK_PIXBUF_DISABLE_SINGLE_INCLUDES -DGTK_DISABLE_SINGLE_INCLUDES"
+	CFLAGS="$CFLAGS -DG_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED"
 fi
 
 dnl ===========================================================================
@@ -82,7 +82,7 @@ AC_ARG_ENABLE(debug,
 	      [ENABLE_DEBUG=no])
 if test x$ENABLE_DEBUG = xyes; then
 	AC_DEFINE(DEBUG, 1, [enable compilation of debugging messages])
-	CFLAGS+=" -g -O0 -DDEBUG"
+	CFLAGS="$CFLAGS -g -O0 -DDEBUG"
 fi
 
 AC_ARG_ENABLE(gseal,
@@ -94,7 +94,7 @@ AC_ARG_ENABLE(gseal,
 	      esac],
 	      [ENABLE_GSEAL=no])
 if test x$ENABLE_GSEAL = xyes; then
-	CFLAGS+=" -DGSEAL_ENABLE"
+	CFLAGS="$CFLAGS -DGSEAL_ENABLE"
 fi
 
 AC_ARG_ENABLE(run_in_place,
@@ -289,7 +289,7 @@ for option in $WARN_CFLAGS; do
 	unset SAVE_CFLAGS
 done
 unset option
-CFLAGS+="$WARNINGS "
+CFLAGS="$CFLAGS $WARNINGS"
 
 dnl ===========================================================================