add X_DEVEL and XFT_DEVEL m4 functions

m4/x11.m4

@@ -0,0 +1,168 @@
+# X11_DEVEL()
+#
+# Check for the presence of the X Window System headers and libraries.
+# Sets the CXXFLAGS and LIBS variables as appropriate.
+AC_DEFUN([X11_DEVEL],
+[
+  AC_PATH_X
+  AC_PATH_XTRA
+  test "$no_x" = "yes" && \
+    AC_MSG_ERROR([The X Window System could not be found.])
+     
+  CXXFLAGS="$CXXFLAGS $X_CFLAGS"
+  LIBS="$LIBS $X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS"
+
+  # Check for required functions in -lX11
+  AC_CHECK_LIB(
+    [X11], [XOpenDisplay],
+    ,
+    AC_MSG_ERROR([Could not find XOpenDisplay in -lX11.])
+  )
+])
+
+
+AC_DEFUN([XFT_ERROR],
+[
+  if test "$XFT_MIN"; then
+    AC_MSG_ERROR([$PACKAGE requires the Xft font library >= $XFT_MIN.
+                  See http://www.fontconfig.org/
+])
+  else
+    AC_MSG_ERROR([$PACKAGE requires the Xft font library.
+                  See http://www.fontconfig.org/
+])
+  fi
+])
+
+# XFT_DEVEL([required-version])
+#
+# Check for the XFT development package.
+# You can use the optional argument to check for a library of at least the
+# given version.
+# It provides the $(PYTHON_CFLAGS) $(PYTHON_LIBS) output variables.
+AC_DEFUN([XFT_DEVEL],
+[
+  AC_REQUIRE([X11_DEVEL])
+
+  if test "$1"; then
+    XFT_MIN=$1
+    XFT_MIN_MAJOR=${XFT_MIN%.*.*}
+    XFT_MIN_MINOR=${XFT_MIN%.*}
+    XFT_MIN_MINOR=${XFT_MIN_MINOR#*.}
+    XFT_MIN_REVISION=${XFT_MIN#*.*.}
+  else
+    XFT_MIN=""
+  fi
+
+  if test -z "$XFT_MIN"; then
+    AC_MSG_CHECKING([for Xft])
+    if ! pkg-config xft; then
+      AC_MSG_RESULT([no])
+      XFT_ERROR
+    fi
+  else
+    AC_MSG_CHECKING([for Xft version >= $XFT_MIN])
+    if ! pkg-config --atleast-version $XFT_MIN xft; then
+      AC_MSG_RESULT([no])
+      XFT_ERROR
+    fi
+  fi
+  AC_MSG_RESULT([yes])
+
+
+  # Store these
+  OLDLIBS=$LIBS
+  OLDCXXFLAGS=$CXXFLAGS
+
+  XFT_CFLAGS="`pkg-config --cflags xft`"
+  XFT_LIBS="`pkg-config --libs xft`"
+
+  # Set these for checking with the tests below. They'll be restored after
+  LIBS="$LIBS $XFT_LIBS"
+  CXXFLAGS="$XFT_CFLAGS $CXXFLAGS"
+
+  AC_CHECK_LIB([Xft], [XftFontOpenName],
+    if test "$XFT_MIN"; then
+      AC_MSG_CHECKING([for X11/Xft/Xft.h for Xft >= $XFT_MIN])
+      AC_TRY_COMPILE(
+      [
+        #include <X11/Xlib.h>
+        #include <X11/Xft/Xft.h>
+      ],
+      [
+        #if !defined(XFT_MAJOR)
+        # error Xft.h is too old
+        #endif
+        #if XFT_MAJOR < $XFT_MIN_MAJOR
+        # error Xft.h is too old
+        #endif
+        #if XFT_MAJOR == $XFT_MIN_MAJOR
+        # if XFT_MINOR < $XFT_MIN_MINOR
+        #  error Xft.h is too old
+        # endif
+        #endif
+        #if XFT_MAJOR == $XFT_MIN_MAJOR
+        # if XFT_MAJOR == $XFT_MIN_MINOR
+        #  if XFT_REVISION < $XFT_MIN_REVISION
+        #   error Xft.h is too old
+        #  endif
+        # endif
+        #endif
+      
+        int i = XFT_MAJOR;
+        XftFont foo;
+      ],
+      [
+        AC_MSG_RESULT([yes])
+      ],
+      [
+        AC_MSG_RESULT([no])
+        XFT_ERROR
+      ])
+    else
+      AC_MSG_CHECKING([for X11/Xft/Xft.h])
+      AC_TRY_COMPILE(
+      [
+        #include <X11/Xlib.h>
+        #include <X11/Xft/Xft.h>
+      ],
+      [
+        int i = XFT_MAJOR; /* make sure were using Xft 2, not 1 */
+        XftFont foo;
+      ],
+      [
+        AC_MSG_RESULT([yes])
+      ],
+      [
+        AC_MSG_RESULT([no])
+        XFT_ERROR
+      ])
+    fi
+
+    AC_MSG_CHECKING([if we can compile with Xft])
+    AC_TRY_LINK(
+    [
+      #include <X11/Xlib.h>
+      #include <X11/Xft/Xft.h>
+    ],
+    [
+      int i = XFT_MAJOR;
+      XftFont foo
+    ],
+    [
+      AC_MSG_RESULT([yes])
+    ],
+    [ 
+      AC_MSG_RESULT([no])
+      AC_MSG_ERROR([Unable to compile with the Xft font library.
+])
+    ])
+  )
+
+# Restore the old values. Use XFT_CFLAGS and XFT_LIBS in the Makefile.am's
+  LIBS=$OLDLIBS
+  CXXFLAGS=$OLDCXXFLAGS
+
+  AC_SUBST([XFT_CFLAGS])
+  AC_SUBST([XFT_LIBS])
+])