diff --git a/tests/Makefile.am b/tests/Makefile.am
index 65f57e3..48eb792 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -6,9 +6,11 @@ if USE_CPPUNIT
 cppunit_tests = caca-test
 endif
 
+EXTRA_DIST = check-build
+
 noinst_PROGRAMS = simple bench $(cppunit_tests)
 
-TESTS = simple $(cppunit_tests)
+TESTS = simple check-build $(cppunit_tests)
 
 simple_SOURCES = simple.c
 simple_LDADD = ../caca/libcaca.la
diff --git a/tests/check-build b/tests/check-build
new file mode 100755
index 0000000..a5f82c5
--- /dev/null
+++ b/tests/check-build
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+failure=0
+
+config_h_in=$(dirname "$0")/../config.h.in
+win32_config_h=$(dirname "$0")/../win32/config.h
+
+for key in $(sed -ne 's/.*#undef *\([A-Za-z0-9_]*\).*/\1/p' "$config_h_in");
+do
+  if ! grep '[ef] \<'"$key"'\>' "$win32_config_h" >/dev/null 2>&1; then
+    echo "error: $key missing from win32/config.h"
+    failure=1
+  fi
+done
+
+if test "$failure" != "0"; then
+  exit 1
+else
+  echo "0 errors in Win32 config.h"
+fi
+
+exit 0
+