diff --git a/brltty.spec b/brltty.spec
index ebc24bf..edfb382 100644
--- a/brltty.spec
+++ b/brltty.spec
@@ -147,13 +147,20 @@ This package provides the OCaml binding for BrlAPI.
 %patch4 -p1 -b .loadLibrary
 
 %build
+# Add the openjdk include directories to CPPFLAGS
 for i in -I/usr/lib/jvm/java/include{,/linux}; do
       java_inc="$java_inc $i"
 done
+export CPPFLAGS="$java_inc" CFLAGS="%{optflags} -fno-strict-aliasing" \
+
+export CFLAGS="%{optflags} -fno-strict-aliasing"
+export CXXFLAGS="%{optflags} -fno-strict-aliasing"
+
 # there is no curses packages in BuildRequires, so the package builds
 # without them in mock; let's express this decision explicitly
-%configure CPPFLAGS="$java_inc" CFLAGS="%{optflags} -fno-strict-aliasing" \
-  CXXFLAGS="%{optflags} -fno-strict-aliasing" --disable-stripping --without-curses \
+%configure \
+  --disable-stripping \
+  --without-curses \
 %if %{with_speech_dispatcher}
   --with-speechd=%{_prefix} \
 %endif