--- a/trunk/Source/autotools/FindDependencies.m4
+++ b/trunk/Source/autotools/FindDependencies.m4
@@ -376,4 +376,11 @@
         [cairo-ft fontconfig >= fontconfig_required_version freetype2 >= freetype2_required_version harfbuzz >= harfbuzz_required_version])
 fi
+# HarfBuzz 0.9.18 splits harbuzz-icu into a separate library.
+# Since we support earlier HarfBuzz versions we keep this conditional for now.
+if $PKG_CONFIG --atleast-version 0.9.18 harfbuzz; then
+    PKG_CHECK_MODULES(HARFBUZZ_ICU, harfbuzz-icu >= $harfbuzz_required_version)
+    FREETYPE_CFLAGS+=" $HARFBUZZ_ICU_CFLAGS"
+    FREETYPE_LIBS+=" $HARFBUZZ_ICU_LIBS"
+fi
 AC_SUBST([FREETYPE_CFLAGS])
 AC_SUBST([FREETYPE_LIBS])