[goffice] Use Lasem when present.

[Jean BrÃfort <jbrefort src gnome org>]

commit 2714531d16b59114909195224c458fe72953b115
Author: Jean Brefort <jean brefort normalesup org>
Date:   Wed Sep 26 21:21:11 2012 +0200

    Use Lasem when present.

 ChangeLog    |    4 ++++
 configure.in |   22 ++++++++++++++++++----
 2 files changed, 22 insertions(+), 4 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 4f41acd..2153d26 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-09-26  Jean Brefort  <jean brefort normalesup org>
+
+	* configure.in: automatically use lasem when present.
+
 2012-09-23  Jean Brefort  <jean brefort normalesup org>
 
 	* goffice/graph/gog-axis.c (map_linear_auto_bound): fix scale when data
diff --git a/configure.in b/configure.in
index aeab0e1..6b77a54 100644
--- a/configure.in
+++ b/configure.in
@@ -125,11 +125,24 @@ dnl Should we use lasem ?
 dnl ***********************
 
 goffice_with_lasem=false
-AC_ARG_WITH(lasem, [  --with-lasem          Build with lasem use])
-if test "x$with_lasem" = xyes; then
-	PKG_CHECK_MODULES(Lasem, lasem-0.4 >= 0.3.1)
+AC_ARG_WITH(lasem,
+	AS_HELP_STRING([--with-lasem[=@<:@no/auto/yes@:>@]],
+                         [Build with lasem use (default=auto)]),
+	,[with_lasem=auto])
+echo -n "\nlasem test result is: "
+echo "$with_lasem"
+echo ""
+
+AS_CASE([$with_lasem],
+	[no],[found_lasem="disabled by request"],
+	[auto], [
+	PKG_CHECK_MODULES(Lasem, lasem-0.4 >= 0.3.3,
+	[found_lasem="yes";goffice_with_lasem=true], [found_lasem="no, missing or too old lasem library"])
+	],
+	[yes],[found_lasem="yes";
+	PKG_CHECK_MODULES(Lasem, lasem-0.4 >= 0.3.3);
 	goffice_with_lasem=true
-fi
+	],[AC_MSG_ERROR([invalid argument passed to --with-lasem, should be one of @<:@no/auto/yes@:>@])])
 if test "x$goffice_with_lasem" = "xtrue" ; then
 	AC_DEFINE(GOFFICE_WITH_LASEM, 1, [Define if Lasem is used])
 	goffice_reqs="$goffice_reqs lasem-0.4 >= 0.3.1 "
@@ -796,6 +809,7 @@ Configuration:
 	Compiler:		${CC}
 	Compiler flags:		${CFLAGS}
 	Long double support:	${float_msg}
+	Equation support in graphs: ${found_lasem}
 
 	UI:			${ui_msg}
 	Configuration backend:	${conf_msg}