During compilation I've got this message:

In file included from filecheck.c:27:
filecheck.h:22: error: syntax error before "uid_t"
filecheck.h:29: error: syntax error before "uid_t"
filecheck.c:56: warning: no previous prototype for 'gdm_file_check'
filecheck.c:175: warning: no previous prototype for 'gdm_auth_file_check'
make[2]: *** [filecheck.o] Error 1
make[2]: Leaving directory `/home/paul/Packages/gdm-2.19.0/daemon'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/paul/Packages/gdm-2.19.0'
make: *** [all] Error 2

--
GDM2 configuration summary:
===========================

CFLAGS : -g -O2 -Wall -Wmissing-prototypes 
LDFLAGS : 

prefix : /usr/local
sysconf : ${prefix}/etc
sysconfsubdir : gdm
gdmconf dir : ${sysconfdir}/${sysconfsubdir}
dmconf dir : ${prefix}/etc/dm
bin dir : ${exec_prefix}/bin
sbin dir : ${exec_prefix}/sbin
PAM prefix : ${sysconfdir}
data dir : ${datarootdir}
X server : /usr/X11R6/bin/X

TCP Wrappers support                  : YES
Xinerama support                      : YES
XDMCP (remote login) support          : YES
Secure remote connection              : NO
DMX (Distributed Multihead X) support : YES
Console helper                        : NO
SELinux support                       : NO
Solaris Trusted Extensions support    : NO
ConsoleKit support                    : YES
Authentication scheme                 : verify-shadow
Extra utilities built                 : gdmopen