[devhelp] libdevhelp: Fix .pc file requires when building with webkit2gtk-4.0

[Frederic Peters <fpeters src gnome org>]

commit 07b29a53eac7d4add1e0d7100d6bf2ecdea36f84
Author: Kalev Lember <kalevlember gmail com>
Date:   Fri Aug 22 23:19:09 2014 +0200

    libdevhelp: Fix .pc file requires when building with webkit2gtk-4.0
    
    Substitute either webkit2gtk-3.0 or webkit2gtk-4.0 in the .pc file,
    depending on what webkit2gtk version devhelp was built with.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735252

 configure.ac              |    1 +
 data/libdevhelp-3.0.pc.in |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e3a7a02..48cdbf6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,7 @@ PKG_CHECK_EXISTS([webkit2gtk-4.0], [
 ], [
        WEBKIT_PKGCONFIG=webkit2gtk-3.0
 ])
+AC_SUBST(WEBKIT_PKGCONFIG)
 
 PKG_CHECK_MODULES(DEVHELP, [
   gthread-2.0 >= 2.10.0
diff --git a/data/libdevhelp-3.0.pc.in b/data/libdevhelp-3.0.pc.in
index 577a3c2..6401ee3 100644
--- a/data/libdevhelp-3.0.pc.in
+++ b/data/libdevhelp-3.0.pc.in
@@ -5,7 +5,7 @@ includedir= includedir@
 
 Name: devhelp
 Description: devhelp
-Requires: gtk+-3.0 webkit2gtk-3.0
+Requires: gtk+-3.0 @WEBKIT_PKGCONFIG@
 Version: @VERSION@
 Libs: -L${libdir} -ldevhelp-3
 Cflags: -I${includedir}/devhelp-3.0