From 6781444835ca04a1e2a441193be031a96e1db6d9 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Sun, 23 Oct 2011 15:35:36 +0000
Subject: [PATCH] Warn user that build will fail if bc is not installed.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@39945 a592a061-630c-0410-9148-cb99ea01b6c8
---
 config/qt4.m4 | 1 +
 configure.ac  | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/config/qt4.m4 b/config/qt4.m4
index be2a21ebf9..eea6fdf4f8 100644
--- a/config/qt4.m4
+++ b/config/qt4.m4
@@ -142,6 +142,7 @@ AC_DEFUN([QT4_DO_IT_ALL],
 	AC_PATH_PROGS(MOC4, [moc-qt4 moc],[],$qt4_cv_bin:$PATH)
 	AC_PATH_PROGS(UIC4, [uic-qt4 uic],[],$qt4_cv_bin:$PATH)
 	AC_PATH_PROGS(RCC4, [rcc-qt4 rcc],[],$qt4_cv_bin:$PATH)
+	AC_CHECK_PROG(bc_found,[bc],[yes],[no],$PATH)
 ])
 
 AC_DEFUN([QT4_DO_PKG_CONFIG],
diff --git a/configure.ac b/configure.ac
index e0890eb361..700f6ff712 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,7 +130,7 @@ for frontend in $FRONTENDS ; do
 	  FRONTEND_INFO="${FRONTEND_INFO}\
   Qt 4 Frontend:\n\
       Qt 4 version:\t\t${QT4_VERSION}\n"
-dnl qt 4 build will fail without moc or uic
+dnl qt 4 build will fail without moc, uic, or bc
 	  if test -z "$MOC4"; then
 	    LYX_ERROR([moc 4 binary not found !])
 	  fi
@@ -140,6 +140,9 @@ dnl qt 4 build will fail without moc or uic
 	  if test -z "$QT4_LIB"; then
 	    LYX_ERROR([qt 4 library not found !])
 	  fi
+	  if test "$bc_found" = "no"; then
+	    LYX_ERROR([bc binary not found !])
+	  fi
       ;;
     *)
 	  LYX_ERROR(Unknown frontend '$frontend');;