--- a/configure.in
+++ b/configure.in
@@ -29,7 +29,7 @@
 EXTERN_CXXFLAGS="$CXXFLAGS"
 
 AC_INIT
-AC_REVISION($Revision: 1.578 $)
+AC_REVISION($Revision: 1.579 $)
 AC_PREREQ(2.57)
 AC_CONFIG_SRCDIR([src/octave.cc])
 AC_CONFIG_HEADER(config.h)
@@ -1432,12 +1432,12 @@
 AC_CHECK_FUNCS(atexit basename bcopy bzero canonicalize_file_name chmod \
   dup2 endgrent endpwent execvp fcntl fork getcwd getegid geteuid \
   getgid getgrent getgrgid getgrnam getpgrp getpid getppid getpwent \
-  getpwuid gettimeofday getuid getwd _kbhit kill link localtime_r \
+  getpwuid gettimeofday getuid getwd _kbhit kill lgamma link localtime_r \
   lstat memmove mkdir mkfifo mkstemp on_exit pipe poll putenv raise \
   readlink realpath rename resolvepath rindex rmdir round select setgrent \
   setlocale setpwent setvbuf sigaction siglongjmp sigpending sigprocmask \
   sigsuspend snprintf stat strcasecmp strdup strerror stricmp \
-  strncasecmp strnicmp strptime strsignal symlink tempnam umask \
+  strncasecmp strnicmp strptime strsignal symlink tempnam tgamma umask \
   uname unlink usleep utime vfprintf vsprintf vsnprintf waitpid \
   _chmod _snprintf x_utime _utime32)