Hello, I have installed gcc within cygwin enviornment, and this is output I get always even if I am trying to compile simples programs. Can anybody help? D:\Documents and Settings\jakuhorn\c>gcc -o hello.exe hello.c /cygdrive/d/DOCUME~1/jakuhorn/LOCALS~1/Temp/ccTTpoz2.o:hello.c:(.text+0x 32): und efined reference to `_prinf' collect2: ld returned 1 exit status Thanks Jakub