diff --git a/config.h.cmake b/config.h.cmake
index a8de2fa3c..b4ca189a9 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -120,6 +120,7 @@
 #cmakedefine HAVE_SYSINFO 1
 #cmakedefine HAVE_STRNLEN 1
 #cmakedefine HAVE_GETIFADDRS 1
+#cmakedefine HAVE_CRYPT 1
 
 #cmakedefine HAVE_SETUSERCONTEXT 1
 #cmakedefine HAVE_GETUSERSHELL 1
diff --git a/kdm/ConfigureChecks.cmake b/kdm/ConfigureChecks.cmake
index 162a8a6ba..ae7ea8b6c 100644
--- a/kdm/ConfigureChecks.cmake
+++ b/kdm/ConfigureChecks.cmake
@@ -27,6 +27,16 @@ check_function_exists( login_getclass HAVE_LOGIN_GETCLASS )
 check_function_exists( auth_timeok HAVE_AUTH_TIMEOK )
 tde_restore( CMAKE_REQUIRED_LIBRARIES )
 
+check_function_exists( crypt LIBC_HAVE_CRYPT )
+if( LIBC_HAVE_CRYPT )
+  set( HAVE_CRYPT 1 CACHE INTERNAL "" FORCE )
+else( )
+  check_library_exists( crypt crypt "" HAVE_CRYPT )
+  if( HAVE_CRYPT )
+    set( CRYPT_LIBRARY crypt )
+  endif( )
+endif( )
+
 check_include_file( lastlog.h HAVE_LASTLOG_H )
 check_include_file( termio.h HAVE_TERMIO_H )
 
diff --git a/kdm/backend/CMakeLists.txt b/kdm/backend/CMakeLists.txt
index 47256a7a7..b93174e4c 100644
--- a/kdm/backend/CMakeLists.txt
+++ b/kdm/backend/CMakeLists.txt
@@ -43,6 +43,6 @@ tde_add_executable( kdm
     process.c protodpy.c reset.c resource.c rpcauth.c
     server.c session.c sessreg.c socket.c streams.c
     util.c xdmauth.c xdmcp.c
-  LINK X11 ${XAU_LIBRARIES} ${DBUS_TQT_LIBRARIES} ${PAM_LIBRARY} ${XDMCP_LIBRARIES}
+  LINK X11 ${XAU_LIBRARIES} ${DBUS_TQT_LIBRARIES} ${CRYPT_LIBRARY} ${PAM_LIBRARY} ${XDMCP_LIBRARIES}
   DESTINATION ${BIN_INSTALL_DIR}
 )