I can not build 21.5 on Solaris 2.5 as of this morning's CVS. (SunOS-4.1.4 works fine, though.) Apparently ptrdiff_t is no longer defined on the Solaris 2.5 platform: gcc -c -O2 -pipe -ffast-math -fno-exceptions -I. -I../src -I/u/shelton/new/src/xemacs-21.5-2001-08-13/lib-src -I/u/shelton/new/src/xemacs-21.5-2001-08-13/src -DHAVE_CONFIG_H -I/u/shelton/new/SunOS-5.5/include \ -DINHIBIT_STRING_HEADER /u/shelton/new/src/xemacs-21.5-2001-08-13/src/regex.c /u/shelton/new/src/xemacs-21.5-2001-08-13/src/regex.c: In function `regex_compile': /u/shelton/new/src/xemacs-21.5-2001-08-13/src/regex.c:2061: `ptrdiff_t' undeclared (first use in this function) Here's the configure command I used: /u/shelton/new/src/xemacs-21.5-2001-08-13/configure --prefix=/u/shelton/new/SunOS-5.5/xemacs-21.5-2001-08-13 --with-gcc --site-includes=/u/shelton/new/SunOS-5.5/include --site-libraries=/u/shelton/new/SunOS-5.5/lib --infopath=/u/shelton/new/info --with-mule=no --compiler=gcc '--cflags=-O2 -pipe -ffast-math -fno-exceptions' --with-dialogs=no --with-widgets=no --package-path=/u/shelton/new/site-packages::/u/shelton/new/xemacs-packages --debug=no --error-checking=none Here's the output of 'uname -a': SunOS ise4 5.5.1 Generic_103640-34 sun4m sparc I don't have time to investigate this in any depth right now because my day job is NT-based, but I will be happy to provide any info I can. Let me know what additional info is needed. - vin -- In a minute there is time For decisions and revisions which a minute will reverse. T.S. Eliot [URL: http://www.cs.amherst.edu/~ccm/prufrock.html]