CentOS mailing list wrote: > I've tried to install qmail 1.03 on CentOS 4.4 using the command: > > # make setup check > > and I received this error: > > ./load auto-str substdio.a error.a str.a > substdio.a(substdo.o)(.text+0x43): In function `allwrite': > : undefined reference to `errno' > collect2: ld returned 1 exit status > make: *** [auto-str] Error 1 > > Can anyone please help? Change the compile command in the conf-cc file contents to something like: gcc -O2 -include /usr/include/errno.h