5.5.10 Segmentation fault at extended DES and Blowfish

Hi, I'm trying to compile 5.5.10 in a 64 bits Slackware 14.1 (gcc 4.8.2 and glibc 2.17) and the configure is returning 2 segfaults at extended DES crypt and Blowfish crypt: configure:85972: checking for extended DES crypt configure:86002: cc -o conftest -I/usr/include -O2 -fPIC -fvisibility=hidden -pthread -D_REENTRANT -L/usr/lib64 conftest.c -lcrypt -lmcrypt -lltdl -lstdc++ -lpcre -lrt -l m -ldl -lnsl -lxml2 -lz -lm -ldl -lxml2 -lz -lm -ldl -lcrypt >&5 conftest.c: In function 'main': conftest.c:458:3: warning: incompatible implicit declaration of built-in function 'exi t' [enabled by default] exit (strcmp((char *)crypt("rasmuslerdorf","_J9..rasm"),"_J9..rasmBYk8r9AiWNc")); ^ configure:86002: $? = 0 configure:86002: ./conftest ./configure: line 2347: 21648 Segmentation fault ./conftest$ac_exeext configure:86002: $? = 139 configure: program exited with status 139 configure:86075: checking for Blowfish crypt configure:86111: cc -o conftest -I/usr/include -O2 -fPIC -fvisibility=hidden -pthread -D_REENTRANT -L/usr/lib64 conftest.c -lcrypt -lmcrypt -lltdl -lstdc++ -lpcre -lrt -l m -ldl -lnsl -lxml2 -lz -lm -ldl -lxml2 -lz -lm -ldl -lcrypt >&5 conftest.c: In function 'main': conftest.c:461:5: warning: incompatible implicit declaration of built-in function 'str cat' [enabled by default] strcat(salt,"rasmuslerd............"); ^ conftest.c:462:5: warning: incompatible implicit declaration of built-in function 'str cpy' [enabled by default] strcpy(answer,salt); ^ conftest.c:464:5: warning: incompatible implicit declaration of built-in function 'exi t' [enabled by default] exit (strcmp((char *)crypt("rasmuslerdorf",salt),answer)); ^ configure:86111: $? = 0 configure:86111: ./conftest ./configure: line 2347: 21671 Segmentation fault ./conftest$ac_exeext configure:86111: $? = 139 I'd like to know if someone can point if it's a problem at PHP or Slackware. Thanks in advance for any help. Regards, Jero