~/Programs/sock-0.1$ make
make  all-recursive
make[1]: Entering directory `/home/krache/Programs/sock-0.1'
Making all in src
make[2]: Entering directory `/home/krache/Programs/sock-0.1/src'
gcc -DHAVE_CONFIG_H -I. -I. -I..   -I/usr/local/include  -Wall -Wstrict-prototypes -g -O2  -c sockopts.c
sockopts.c: In function ‘sockopts’:
sockopts.c:42: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:60: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:78: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:97: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:118: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:137: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:192: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:211: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:229: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:242: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:259: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:281: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:304: warning: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness
sockopts.c:339: error: invalid storage class for function ‘sigio_func’
sockopts.c:347: error: ‘sigio_func’ undeclared (first use in this function)
sockopts.c:347: error: (Each undeclared identifier is reported only once
sockopts.c:347: error: for each function it appears in.)
make[2]: *** [sockopts.o] Error 1
make[2]: Leaving directory `/home/krache/Programs/sock-0.1/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/krache/Programs/sock-0.1'
make: *** [all-recursive-am] Error 2