Hello I've managed to compile pam_radius-1.3.17 both 32Bit and 64Bit. I had to add -lsocket as part of linking to get it to work and modified the make file to have -m64 to compile on 64bit When I compile it for 64Bit this is my make output: gcc -Wall -fPIC -m64 -c pam_radius_auth.c -o pam_radius_auth.o pam_radius_auth.c: In function `ipstr2long': pam_radius_auth.c:185: warning: subscript has type `char' pam_radius_auth.c: In function `good_ipaddr': pam_radius_auth.c:221: warning: subscript has type `char' pam_radius_auth.c: In function `host2server': pam_radius_auth.c:277: warning: subscript has type `char' pam_radius_auth.c: In function `rad_converse': pam_radius_auth.c:1027: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1030: warning: passing arg 2 of pointer to function from incompatible pointer type pam_radius_auth.c: In function `pam_sm_authenticate': pam_radius_auth.c:1081: warning: passing arg 2 of `pam_get_user' from incompatible pointer type pam_radius_auth.c:1097: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1102: warning: assignment from incompatible pointer type pam_radius_auth.c:1121: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1135: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1168: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c: In function `pam_private_session': pam_radius_auth.c:1300: warning: passing arg 2 of `pam_get_user' from incompatible pointer type pam_radius_auth.c:1321: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c: In function `pam_sm_chauthtok': pam_radius_auth.c:1407: warning: passing arg 2 of `pam_get_user' from incompatible pointer type pam_radius_auth.c:1428: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1437: warning: passing arg 3 of `pam_get_item' from incompatible pointer type pam_radius_auth.c:1442: warning: passing arg 3 of `pam_get_item' from incompatible pointer type gcc -Wall -fPIC -m64 -m64 -I/usr/local/include -R/usr/local/lib/sparcv9 -c md5.c gcc -R/usr/local/lib/sparcv9 -m64 -shared pam_radius_auth.o md5.o -lpam -lsocket -lc -o pam_radius_auth.so Which is all well and good. But when I try and use the 64Bit version of pamtester it core dumps. The 32Bit version compiles fine, and 32bit version of pamtester also works fine. ./pamtester jpam peter authenticate Password: Bus Error (core dumped) In /var/adm/messages I get: Sep 22 13:51:46 sf2428 genunix: [ID 603404 kern.notice] NOTICE: core_log: pamtester[13662] core dumped: /var/core/core_sol9_pamtester_0_0_1285120305_13662 Any suggestions on what to do with gdb or to debug this problem?? I've seen a number of posts such as this one: http://networking.itags.org/networking-tech/58575/ Talking about changing the typedef for md5.h -#define uint32 u_int32_t +#define uint32 uint32_t However 1.3.17 already seems to have this patch. struct MD5Context { uint32_t buf[4]; uint32_t bits[2]; unsigned char in[64]; }; I'm no C developer so not sure where to go to from here. Any suggestions would be gratefully accepted. Cheers Peter