+### Check which frontend we want to use. The default is XForms
+###
+AC_DEFUN(LYX_USE_FRONTEND,
+[AC_MSG_CHECKING([what frontend should be used as main GUI])
+AC_ARG_WITH(frontend,
+ [ --with-frontend=THIS Use THIS frontend as main GUI:
+ Possible values: xforms, qt2, gnome],
+ [lyx_use_frontend="$withval"], [lyx_use_frontend="xforms"])
+AC_MSG_RESULT($lyx_use_frontend)
+AC_SUBST(FRONTEND)
+AC_SUBST(FRONTEND_GUILIB)
+AC_SUBST(FRONTEND_LDFLAGS)
+AC_SUBST(FRONTEND_INCLUDES)
+AC_SUBST(FRONTEND_LIBS)
+])
+
+
+dnl Check things are declared in headers to avoid errors or warnings.
+dnl Called like LYX_CHECK_DECL(function, headerfile)
+dnl Defines HAVE_DECL_{FUNCTION}
+AC_DEFUN(LYX_CHECK_DECL,
+[AC_MSG_CHECKING(if $1 is declared by header $2)
+tr_func=`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+
+tr_hdr=`echo $2 | tr . _`
+AC_CACHE_VAL([lyx_cv_declare_${tr_hdr}_$1],
+[AC_EGREP_HEADER($1, $2, [eval "lyx_cv_declare_${tr_hdr}_$1=yes"], [eval "lyx_cv_declare_${tr_hdr}_$1=no"])])
+if eval "test \"\${lyx_cv_declare_${tr_hdr}_$1}\" = \"yes\""; then
+ AC_DEFINE_UNQUOTED(HAVE_DECL_${tr_func})
+ AC_MSG_RESULT(yes)
+else
+ AC_MSG_RESULT(no)
+fi])
+
+dnl This is the multiple headers version of the LYX_CHECK_DECL macro above.
+dnl Called like LYX_CHECK_DECL_HDRS(function, file1 file2 file3)
+AC_DEFUN(LYX_CHECK_DECL_HDRS,
+[ got="no"
+for I in $2; do
+tr_hdr=`echo $I | tr . _`
+if test "${got}" = "no"; then
+ LYX_CHECK_DECL($1, $I)
+fi
+if eval "test \"\${lyx_cv_declare_${tr_hdr}_$1}\" = \"yes\""; then
+ got="yes"
+fi
+done])
+
+
+## ------------------------------------------------------------------------
+## Find a file (or one of more files in a list of dirs)
+## ------------------------------------------------------------------------
+##
+AC_DEFUN(AC_FIND_FILE,
+[
+$3=NO
+for i in $2;
+do
+ for j in $1;
+ do
+ if test -r "$i/$j"; then
+ $3=$i
+ break 2
+ fi
+ done
+done
+])
+
+dnl just a wrapper to clean up configure.in
+AC_DEFUN(LYX_PROG_LIBTOOL,
+[
+AC_REQUIRE([AC_ENABLE_SHARED])
+AC_REQUIRE([AC_ENABLE_STATIC])
+dnl libtool is only for C, so I must force him
+dnl to find the correct flags for C++
+ac_save_cc=$CC
+ac_save_cflags="$CFLAGS"
+CC=$CXX
+CFLAGS="$CXXFLAGS"
+AM_PROG_LIBTOOL dnl for libraries
+CC=$ac_save_cc
+CFLAGS="$ac_save_cflags"
+])