Fix gphoto2 library detection

Use pkg-config file, if possible

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

digikam/configure.in.in

@@ -124,6 +124,13 @@ AC_SUBST(LCMS_LIBS)
 #
 #------------------------------------------------------------------
 
+KDE_PKG_CHECK_MODULES(GPHOTO2, libgphoto2 >= 2.5,
+         [have_libgphoto2=yes, have_gphoto25=yes], have_libgphoto2=no)
+if test "x$have_libgphoto2" = "xno"; then
+  KDE_PKG_CHECK_MODULES(GPHOTO2, libgphoto2,
+         have_libgphoto2=yes, have_libgphoto2=no)
+fi
+if test "x$have_libgphoto2" = "xno"; then
   AC_PATH_PROG(GPHOTO_CONFIG,gphoto2-config)
   AC_PATH_PROG(GPHOTO_PORT_CONFIG,gphoto2-port-config)
   if test -n "${GPHOTO_CONFIG}"; then
@@ -137,6 +144,16 @@ else
     AC_MSG_WARN([gPhoto2 not found.])
     DO_NOT_COMPILE="digikam $DO_NOT_COMPILE"
   fi
+else
+  if test "x$have_gphoto25" = "xyes"; then
+    GPHOTO_CFLAGS="$GPHOTO2_CFLAGS -DHAVE_GPHOTO25"
+  else
+    GPHOTO_CFLAGS="$GPHOTO2_CFLAGS"
+  fi
+  LIB_GPHOTO="$GPHOTO2_LIBS"
+  AC_SUBST(GPHOTO_CFLAGS)
+  AC_SUBST(LIB_GPHOTO)
+fi
 
 CXXFLAGS="$CXXFLAGS -DQT_CLEAN_NAMESPACE"