Index: xdelta3/configure.ac
--- xdelta3/configure.ac.orig
+++ xdelta3/configure.ac
@@ -22,7 +22,15 @@ AC_ARG_WITH(
     [USE_LIBLZMA=$withval],
     [USE_LIBLZMA=auto])
 
+AC_PATH_PROG(PKG_CONFIG, pkg-config)
+
 if test "x$USE_LIBLZMA" != xno ; then
+    if test -n "$PKG_CONFIG"; then
+        LZMA_CFLAGS="`$PKG_CONFIG --cflags liblzma`"
+        CFLAGS="$CFLAGS $LZMA_CFLAGS"
+        LZMA_LDFLAGS="`$PKG_CONFIG --libs liblzma`"
+        LDFLAGS="$LDFLAGS $LZMA_LDFLAGS"
+    fi
     AC_CHECK_HEADERS([lzma.h],,[
         if test "x$with_liblzma" = xyes ; then
             AC_MSG_FAILURE([liblzma includes were not found])