Make this build on glibc systems.

Submitted by:	Dmitry V. Levin <ldv@altlinux.org>


git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@225 185d5e19-27fe-0310-9dcf-9bff6b9f3609

modules/pam_unix/pam_unix.c

@@ -31,7 +31,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/modules/pam_unix/pam_unix.c#3 $
+ * $P4: //depot/projects/openpam/modules/pam_unix/pam_unix.c#4 $
  */
 
 #include <sys/param.h>
@@ -42,6 +42,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#ifdef __GLIBC__
+#include <crypt.h>
+#endif
+
 #include <security/pam_modules.h>
 #include <security/pam_appl.h>