sprink ~/repos/libhijack/src $ make
gcc -fPIC -g -Wall -DDEBUG -Di686 -I../include -fvisibility=hidden -c libhijack.c
In file included from libhijack.c:24:
../include/hijack.h:55: error: expected specifier-qualifier-list before 'ElfW'
../include/hijack.h:61: error: expected specifier-qualifier-list before 'ElfW'
../include/hijack.h:67: error: expected specifier-qualifier-list before 'ElfW'
libhijack.c: In function 'Attach':
libhijack.c:202: error: 'PTRACE_ATTACH' undeclared (first use in this function)
libhijack.c:202: error: (Each undeclared identifier is reported only once
libhijack.c:202: error: for each function it appears in.)
libhijack.c:202: warning: passing argument 4 of 'ptrace' makes integer from pointer without a cast
libhijack.c: In function 'Detach':
libhijack.c:231: error: 'PTRACE_DETACH' undeclared (first use in this function)
libhijack.c:231: warning: passing argument 4 of 'ptrace' makes integer from pointer without a cast
libhijack.c: In function 'GetRegs':
libhijack.c:359: error: invalid application of 'sizeof' to incomplete type 'struct user_regs_struct'
libhijack.c:363: error: 'PTRACE_GETREGS' undeclared (first use in this function)
libhijack.c:363: warning: passing argument 4 of 'ptrace' makes integer from pointer without a cast
libhijack.c: In function 'SetRegs':
libhijack.c:384: error: 'PTRACE_SETREGS' undeclared (first use in this function)
libhijack.c:384: warning: passing argument 4 of 'ptrace' makes integer from pointer without a cast
*** Error code 1

Stop in /usr/home/sprink/repos/libhijack/src.