diff --git a/test/Makefile.am b/test/Makefile.am
index d6e03adb..f95a942a 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -16,7 +16,7 @@ noinst_PROGRAMS = quad sandbox lol-bench lol-test
 
 TESTS = lol-test
 
-lol_test_SOURCES = lol-test.cpp matrix.cpp half.cpp trig.cpp
+lol_test_SOURCES = lol-test.cpp matrix.cpp half.cpp trig.cpp build.cpp
 lol_test_CPPFLAGS = @LOL_CFLAGS@ @PIPI_CFLAGS@
 lol_test_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
 lol_test_DEPENDENCIES = $(top_builddir)/src/liblol.a
diff --git a/test/build.cpp b/test/build.cpp
new file mode 100644
index 00000000..38c4372b
--- /dev/null
+++ b/test/build.cpp
@@ -0,0 +1,58 @@
+//
+// Lol Engine
+//
+// Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net>
+//   This program is free software; you can redistribute it and/or
+//   modify it under the terms of the Do What The Fuck You Want To
+//   Public License, Version 2, as published by Sam Hocevar. See
+//   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
+//
+
+#if defined HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include "core.h"
+#include "lol/unit.h"
+
+namespace lol
+{
+
+LOLUNIT_FIXTURE(BuildTest)
+{
+    LOLUNIT_TEST(FastMath)
+    {
+        double x, y;
+
+        y = x = 1.0 + RandF(0.1f, 0.2f);
+        y += 4503599627370496.0;
+        /* The compiler should optimise this away */
+        y -= 4503599627370496.0;
+
+        LOLUNIT_ASSERT_EQUAL(x, y);
+    }
+
+    LOLUNIT_TEST(FastMathOverride)
+    {
+        double x, y;
+
+        y = x = 1.0 + RandF(0.1f, 0.2f);
+        y += 4503599627370496.0;
+        FP_USE(y);
+        /* The compiler should not optimise this away */
+        y -= 4503599627370496.0;
+
+        LOLUNIT_ASSERT_EQUAL(1.0, y);
+    }
+
+    LOLUNIT_TEST(IsNaN)
+    {
+        union { float f; uint32_t x; } u;
+
+        u.x = 0x7fc00000u;
+        LOLUNIT_ASSERT(isnan(u.f));
+    }
+};
+
+} /* namespace lol */
+