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gcc -O2 -fPIC -I/usr/include -c src/unix.c -o src/unix.o -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
src/unix.c: In function ‘u_readdir_r’:
src/unix.c:2242:2: warning: ‘readdir_r’ is deprecated [-Wdeprecated-declarations]
  return readdir_r(dp, ent, res);
  ^~~~~~
In file included from src/unix.c:46:
/usr/include/dirent.h:183:12: note: declared here
 extern int readdir_r (DIR *__restrict __dirp,
            ^~~~~~~~~
src/unix.c: In function ‘u_reallocarray.constprop’:
src/unix.c:789:14: warning: argument 2 value ‘18446744073709551615’ exceeds maximum object size 9223372036854775807 [-Walloc-size-larger-than=]
  if (!(tmp = realloc(*arr, tmpsiz)))
              ^~~~~~~~~~~~~~~~~~~~~
In file included from src/unix.c:20:
/usr/include/stdlib.h:549:14: note: in a call to allocation function ‘realloc’ declared here
 extern void *realloc (void *__ptr, size_t __size)
              ^~~~~~~

Installing http://luarocks.org/manifests/daurnimator/lunix-20161026-1.src.rock
gcc -O2 -fPIC -I/home/travis/hererocks/include -c src/unix.c -o src/unix.o -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
src/unix.c:486:14: error: static declaration of ‘luaL_testudata’ follows non-static declaration
 static void *luaL_testudata(lua_State *L, int index, const char *tname) {
              ^
In file included from src/unix.c:55:0:
/home/travis/hererocks/include/lauxlib.h:91:19: note: previous declaration of ‘luaL_testudata’ was here
 LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname);
                   ^
src/unix.c:501:13: error: static declaration of ‘luaL_setmetatable’ follows non-static declaration
 static void luaL_setmetatable(lua_State *L, const char *tname) {
             ^
In file included from src/unix.c:55:0:
/home/travis/hererocks/include/lauxlib.h:92:18: note: previous declaration of ‘luaL_setmetatable’ was here
 LUALIB_API void (luaL_setmetatable) (lua_State *L, const char *tname);
                  ^
src/unix.c:507:13: error: static declaration of ‘luaL_setfuncs’ follows non-static declaration
 static void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup) {
             ^
In file included from src/unix.c:55:0:
/home/travis/hererocks/include/lauxlib.h:88:18: note: previous declaration of ‘luaL_setfuncs’ was here
 LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);
                  ^
src/unix.c:521:0: warning: "luaL_newlibtable" redefined [enabled by default]
 #define luaL_newlibtable(L, l) \
 ^
In file included from src/unix.c:55:0:
/home/travis/hererocks/include/lauxlib.h:123:0: note: this is the location of the previous definition
 #define luaL_newlibtable(L, l) \
 ^
src/unix.c:524:0: warning: "luaL_newlib" redefined [enabled by default]
 #define luaL_newlib(L, l) \
 ^
In file included from src/unix.c:55:0:
/home/travis/hererocks/include/lauxlib.h:125:0: note: this is the location of the previous definition
 #define luaL_newlib(L, l) (luaL_newlibtable(L, l), luaL_setfuncs(L, l, 0))
 ^
Error: Failed installing dependency: http://luarocks.org/manifests/daurnimator/lunix-20161026-1.src.rock - Build error: Failed compiling object src/unix.o

$ make all5.1                          
enabling Lua 5.1                                                                                                                       
mkdir -p lunix/src/5.1                                                      
gcc -O2 -std=gnu99 -fPIC -g -Wall -Wextra  -Wno-missing-field-initializers  -Wno-override-init -Wno-unused  -I/nix/store/nl45sii2pigq7j
ndb3wpz9kl3xk0p4qn-lua-5.1.5/include -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE  -o lunix/src/5.1/unix.so lunix/src/unix.c -shared   -L/usr/local/lib -L/usr/local/lib -lrt -lm 
lunix/src/unix.c:576:10: fatal error: sys/sysctl.h: No such file or directory                                                                                                                                      
  576 | #if HAVE_SYS_SYSCTL_H                                                                                                          
      |          ^~~~~~~~~~~~                                                                                                          
compilation terminated.                                                                                                                
make: *** [lunix/src/GNUmakefile:58: lunix/src/5.1/unix.so] Error 1  

musl-gcc -O2 -fPIC -I/usr/include/lua5.1 -c src/unix.c -o src/unix.o -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
src/unix.c: In function ‘unixL_strsignal’:
src/unix.c:2635:44: error: ‘sys_siglist’ undeclared (first use in this function)
  if (signo >= 0 && signo < NSIG && (info = sys_siglist[signo]))