diff --git a/configure.in b/configure.in
index ab22aa5..09f2c3b 100644
--- a/configure.in
+++ b/configure.in
@@ -95,6 +95,13 @@ AC_CHECK_PROG(have_doxygen, doxygen, yes, no)
 AC_CHECK_PROG(have_dot, dot, yes, no)
 PKG_PROG_PKG_CONFIG
 
+# libraries
+AC_CHECK_HEADER(log4cxx/logger.h, [have_log4cxx=yes])
+AC_CHECK_HEADER(ltdl.h, [have_ltdl=yes])
+AC_CHECK_HEADER(regex.h, [have_regex=yes])
+AC_CHECK_HEADERS(unistd.h fcntl.h, [have_exec=yes])
+AC_CHECK_HEADER(dirent.h, [have_dir=yes])
+
 # solaris?
 AC_CHECK_HEADER(sys/old_procfs.h, [AM_CPPFLAGS=-D__solaris__])
 
@@ -233,13 +240,6 @@ test "$enableval" = "yes" && HAVE_DOXYGEN="YES" || HAVE_DOXYGEN="NO";
 AM_CONDITIONAL(HAVE_DOXYGEN, test "$enableval" = "yes")
 AM_PATH_CPPUNIT([1.0.0], [have_cppunit="yes"], [have_cppunit="no"])
 
-# libraries
-AC_CHECK_HEADER(log4cxx/logger.h, [have_log4cxx=yes])
-AC_CHECK_HEADER(ltdl.h, [have_ltdl=yes])
-AC_CHECK_HEADER(regex.h, [have_regex=yes])
-AC_CHECK_HEADERS(unistd.h fcntl.h, [have_exec=yes])
-AC_CHECK_HEADER(dirent.h, [have_dir=yes])
-
 MINGW32=no
 MAC=no
 case $host_os in