diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index bd2443c0ce87..59e85247b609 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2009-01-05  Benjamin Kosnik  <bkoz@redhat.com>
+
+	PR libstdc++/38384
+	* crossconfig.m4: Define HAVE_FABSF for hpux crosses.
+
 2009-01-05  Ben Elliston  <bje@au.ibm.com>
 
         * configure.ac (GLIBCXX_CHECK_STANDARD_LAYOUT): Remove invocation.
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 1d170ce60d5c..d5e6752cdf45 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -81407,6 +81407,10 @@ _ACEOF
 
     cat >>confdefs.h <<\_ACEOF
 #define HAVE_COPYSIGNF 1
+_ACEOF
+
+    cat >>confdefs.h <<\_ACEOF
+#define HAVE_FABSF 1
 _ACEOF
 
     cat >>confdefs.h <<\_ACEOF
diff --git a/libstdc++-v3/crossconfig.m4 b/libstdc++-v3/crossconfig.m4
index 399077546d30..b90bc076a23d 100644
--- a/libstdc++-v3/crossconfig.m4
+++ b/libstdc++-v3/crossconfig.m4
@@ -111,6 +111,7 @@ case "${host}" in
     GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT
     AC_DEFINE(HAVE_COPYSIGN)
     AC_DEFINE(HAVE_COPYSIGNF)
+    AC_DEFINE(HAVE_FABSF)
     AC_DEFINE(HAVE_FREXPF)
     AC_DEFINE(HAVE_HYPOT)
     case "$target" in