diff --git a/Makefile b/Makefile
index 4f831034b..3604d1da0 100644
--- a/Makefile
+++ b/Makefile
@@ -121,6 +121,7 @@ include libc/tinymath/tinymath.mk		# │  You can issue raw system calls
 include third_party/compiler_rt/compiler_rt.mk	# │
 include libc/str/str.mk				# │
 include third_party/xed/xed.mk			# │
+include third_party/puff/puff.mk		# │
 include third_party/zlib/zlib.mk		# │
 include third_party/double-conversion/dc.mk	# │
 include libc/elf/elf.mk				# │
@@ -309,7 +310,6 @@ COSMOPOLITAN_OBJECTS =			\
 	LIBC_LOG			\
 	LIBC_TIME			\
 	LIBC_ZIPOS			\
-	THIRD_PARTY_ZLIB		\
 	THIRD_PARTY_MUSL		\
 	LIBC_STDIO			\
 	THIRD_PARTY_GDTOA		\
@@ -335,6 +335,7 @@ COSMOPOLITAN_OBJECTS =			\
 	LIBC_NT_ADVAPI32		\
 	LIBC_NT_SYNCHRONIZATION		\
 	LIBC_FMT			\
+	THIRD_PARTY_PUFF		\
 	THIRD_PARTY_COMPILER_RT		\
 	LIBC_TINYMATH			\
 	THIRD_PARTY_XED			\
diff --git a/examples/getdomainname.c b/examples/getdomainname.c
new file mode 100644
index 000000000..b387d0236
--- /dev/null
+++ b/examples/getdomainname.c
@@ -0,0 +1,21 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/stdio/stdio.h"
+
+int main(int argc, char *argv[]) {
+  char buf[256];
+  if (!getdomainname(buf, sizeof(buf))) {
+    printf("%s\n", buf);
+    return 0;
+  } else {
+    return 1;
+  }
+}
diff --git a/libc/isystem/sys/vfs.h b/libc/isystem/sys/vfs.h
new file mode 100644
index 000000000..9d8ac9412
--- /dev/null
+++ b/libc/isystem/sys/vfs.h
@@ -0,0 +1,4 @@
+#ifndef COSMOPOLITAN_LIBC_ISYSTEM_SYS_VFS_H_
+#define COSMOPOLITAN_LIBC_ISYSTEM_SYS_VFS_H_
+#include "libc/calls/struct/statfs.h"
+#endif /* COSMOPOLITAN_LIBC_ISYSTEM_SYS_VFS_H_ */
diff --git a/libc/isystem/zlib.h b/libc/isystem/zlib.h
deleted file mode 100644
index 705f3db8c..000000000
--- a/libc/isystem/zlib.h
+++ /dev/null
@@ -1,4 +0,0 @@
-#ifndef COSMOPOLITAN_LIBC_ISYSTEM_ZLIB_H_
-#define COSMOPOLITAN_LIBC_ISYSTEM_ZLIB_H_
-#include "third_party/zlib/zlib.h"
-#endif /* COSMOPOLITAN_LIBC_ISYSTEM_ZLIB_H_ */
diff --git a/libc/runtime/getmaxfd.c b/libc/runtime/getmaxfd.c
index 59704886e..14f63eee4 100644
--- a/libc/runtime/getmaxfd.c
+++ b/libc/runtime/getmaxfd.c
@@ -26,12 +26,12 @@
 /**
  * Returns maximum number of open files.
  */
-long GetMaxFd(void) {
+long _GetMaxFd(void) {
   int rc;
   if (IsNetbsd()) {
     if ((rc = __sys_fcntl(0, F_MAXFD, 0)) != -1) {
       return rc;
     }
   }
-  return GetResourceLimit(RLIMIT_NOFILE);
+  return _GetResourceLimit(RLIMIT_NOFILE);
 }
diff --git a/libc/runtime/getresourcelimit.c b/libc/runtime/getresourcelimit.c
index a10160ac5..e678149f0 100644
--- a/libc/runtime/getresourcelimit.c
+++ b/libc/runtime/getresourcelimit.c
@@ -21,7 +21,7 @@
 #include "libc/macros.internal.h"
 #include "libc/sysv/consts/rlim.h"
 
-long GetResourceLimit(int resource) {
+long _GetResourceLimit(int resource) {
   struct rlimit rl;
   getrlimit(resource, &rl);
   if (rl.rlim_cur == RLIM_INFINITY) return -1;
diff --git a/libc/runtime/getsymboltable.c b/libc/runtime/getsymboltable.c
index 3862d45ac..df491f9e8 100644
--- a/libc/runtime/getsymboltable.c
+++ b/libc/runtime/getsymboltable.c
@@ -30,7 +30,7 @@
 #include "libc/x/x.h"
 #include "libc/zip.h"
 #include "libc/zipos/zipos.internal.h"
-#include "third_party/zlib/puff.h"
+#include "third_party/puff/puff.h"
 
 static pthread_spinlock_t g_lock;
 _Hide struct SymbolTable *__symtab;  // for kprintf
diff --git a/libc/runtime/inflate.c b/libc/runtime/inflate.c
index 09679dbdf..5f33a0f2d 100644
--- a/libc/runtime/inflate.c
+++ b/libc/runtime/inflate.c
@@ -20,7 +20,7 @@
 #include "libc/intrin/weaken.h"
 #include "libc/macros.internal.h"
 #include "libc/runtime/runtime.h"
-#include "third_party/zlib/puff.h"
+#include "third_party/puff/puff.h"
 #include "third_party/zlib/zlib.h"
 
 /**
@@ -54,7 +54,7 @@ int __inflate(void *out, size_t outsize, const void *in, size_t insize) {
       rc = rc;
     }
   } else {
-    rc = puff(out, &outsize, in, &insize);
+    rc = _puff(out, &outsize, in, &insize);
   }
   STRACE("inflate([%#.*hhs%s], %'zu, %#.*hhs%s, %'zu) → %d", MIN(40, outsize),
          out, outsize > 40 ? "..." : "", outsize, MIN(40, insize), in,
diff --git a/libc/runtime/internal.h b/libc/runtime/internal.h
index ba5fa93fe..85cb1575c 100644
--- a/libc/runtime/internal.h
+++ b/libc/runtime/internal.h
@@ -44,9 +44,9 @@ int GetDosEnviron(const char16_t *, char *, size_t, char **, size_t);
 bool __intercept_flag(int *, char *[], const char *);
 int sys_mprotect_nt(void *, size_t, int) _Hide;
 int __inflate(void *, size_t, const void *, size_t);
-noasan void *Mmap(void *addr, size_t size, int prot, int flags, int fd,
-                  int64_t off) _Hide;
-noasan int Munmap(char *, size_t) _Hide;
+noasan void *_Mmap(void *addr, size_t size, int prot, int flags, int fd,
+                   int64_t off) _Hide;
+noasan int _Munmap(char *, size_t) _Hide;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
diff --git a/libc/runtime/isdynamicexecutable.c b/libc/runtime/isdynamicexecutable.c
index 06e14823e..588da0009 100644
--- a/libc/runtime/isdynamicexecutable.c
+++ b/libc/runtime/isdynamicexecutable.c
@@ -33,7 +33,7 @@
 /**
  * Returns true if ELF executable uses dynamic loading magic.
  */
-bool IsDynamicExecutable(const char *prog) {
+bool _IsDynamicExecutable(const char *prog) {
   bool res;
   Elf64_Ehdr *e;
   Elf64_Phdr *p;
diff --git a/libc/runtime/mmap.c b/libc/runtime/mmap.c
index e9c274f1e..b887410ba 100644
--- a/libc/runtime/mmap.c
+++ b/libc/runtime/mmap.c
@@ -238,8 +238,8 @@ static textwindows dontinline noasan void *MapMemories(char *addr, size_t size,
   return addr;
 }
 
-noasan inline void *Mmap(void *addr, size_t size, int prot, int flags, int fd,
-                         int64_t off) {
+noasan inline void *_Mmap(void *addr, size_t size, int prot, int flags, int fd,
+                          int64_t off) {
   char *p = addr;
   struct DirectMap dm;
   int a, b, i, f, m, n, x;
@@ -494,7 +494,7 @@ void *mmap(void *addr, size_t size, int prot, int flags, int fd, int64_t off) {
 #endif
   __mmi_lock();
   if (!__isfdkind(fd, kFdZip)) {
-    res = Mmap(addr, size, prot, flags, fd, off);
+    res = _Mmap(addr, size, prot, flags, fd, off);
   } else {
     res = _weaken(__zipos_Mmap)(
         addr, size, prot, flags,
diff --git a/libc/runtime/munmap.c b/libc/runtime/munmap.c
index b1baac6b2..e4781bdbb 100644
--- a/libc/runtime/munmap.c
+++ b/libc/runtime/munmap.c
@@ -53,7 +53,7 @@ static noasan void MunmapShadow(char *p, size_t n) {
       // to be >1mb since we can only unmap it if it's aligned, and
       // as such we poison the edges if there are any.
       __repstosb((void *)a, kAsanUnmapped, x - a);
-      Munmap((void *)x, y - x);
+      _Munmap((void *)x, y - x);
       __repstosb((void *)y, kAsanUnmapped, b - y);
     } else {
       // otherwise just poison and assume reuse
@@ -113,7 +113,7 @@ static noasan void MunmapImpl(char *p, size_t n) {
   }
 }
 
-noasan int Munmap(char *p, size_t n) {
+noasan int _Munmap(char *p, size_t n) {
   unsigned i;
   char poison;
   intptr_t a, b, x, y;
@@ -157,7 +157,7 @@ int munmap(void *p, size_t n) {
   int rc;
   size_t toto;
   __mmi_lock();
-  rc = Munmap(p, n);
+  rc = _Munmap(p, n);
 #if SYSDEBUG
   toto = __strace > 0 ? GetMemtrackSize(&_mmi) : 0;
 #endif
diff --git a/libc/runtime/openexecutable.S b/libc/runtime/openexecutable.S
index 8ed1ae5f5..cc15a70ae 100644
--- a/libc/runtime/openexecutable.S
+++ b/libc/runtime/openexecutable.S
@@ -30,7 +30,7 @@
 //	@return	file descriptor
 //	@note	only works on .com binary (not .com.dbg)
 //	@note	only supports linux, freebsd, openbsd, and netbsd
-OpenExecutable:
+_OpenExecutable:
 	push	%rbp
 	mov	%rsp,%rbp
 	pushq	__NR_open(%rip)			# -0x08(%rbp)
@@ -198,7 +198,7 @@ OpenExecutable:
 	pop	%rbx
 	leave
 	ret
-9:	.endfn	OpenExecutable,globl
+9:	.endfn	_OpenExecutable,globl
 
 	.weak	ape_rom_vaddr
 	.weak	ape_rom_filesz
diff --git a/libc/runtime/runtime.h b/libc/runtime/runtime.h
index d8aa565e6..4f415c4c1 100644
--- a/libc/runtime/runtime.h
+++ b/libc/runtime/runtime.h
@@ -94,12 +94,12 @@ void _peekall(void);
 void _savexmm(void *);
 void _weakfree(void *);
 void free_s(void *) paramsnonnull() libcesque;
-int OpenExecutable(void);
+int _OpenExecutable(void);
 int ftrace_install(void);
 int ftrace_enabled(int);
 int strace_enabled(int);
-long GetResourceLimit(int);
-long GetMaxFd(void);
+long _GetResourceLimit(int);
+long _GetMaxFd(void);
 char *GetProgramExecutableName(void);
 char *GetInterpreterExecutableName(char *, size_t);
 void __printargs(const char *);
@@ -108,7 +108,7 @@ int __arg_max(void);
 void __print_maps(void);
 void __warn_if_powersave(void);
 const char *__describe_os(void);
-bool IsDynamicExecutable(const char *);
+bool _IsDynamicExecutable(const char *);
 void _restorewintty(void);
 const char *GetCpuidOs(void);
 const char *GetCpuidEmulator(void);
diff --git a/libc/runtime/runtime.mk b/libc/runtime/runtime.mk
index 7454c8be5..6a37e86a4 100644
--- a/libc/runtime/runtime.mk
+++ b/libc/runtime/runtime.mk
@@ -45,7 +45,7 @@ LIBC_RUNTIME_A_DIRECTDEPS =				\
 	LIBC_STUBS					\
 	LIBC_SYSV					\
 	LIBC_SYSV_CALLS					\
-	THIRD_PARTY_ZLIB				\
+	THIRD_PARTY_PUFF				\
 	THIRD_PARTY_XED
 
 LIBC_RUNTIME_A_DEPS :=					\
diff --git a/libc/runtime/sysconf.c b/libc/runtime/sysconf.c
index a3f835d9b..51d1f7977 100644
--- a/libc/runtime/sysconf.c
+++ b/libc/runtime/sysconf.c
@@ -41,11 +41,11 @@ long sysconf(int name) {
     case _SC_ARG_MAX:
       return _ARG_MAX;
     case _SC_CHILD_MAX:
-      return GetResourceLimit(RLIMIT_NPROC);
+      return _GetResourceLimit(RLIMIT_NPROC);
     case _SC_CLK_TCK:
       return CLK_TCK;
     case _SC_OPEN_MAX:
-      return GetMaxFd();
+      return _GetMaxFd();
     case _SC_PAGESIZE:
       return FRAMESIZE;
     case _SC_NPROCESSORS_ONLN:
diff --git a/libc/zipos/mmap.c b/libc/zipos/mmap.c
index bddd1b743..898c55bb9 100644
--- a/libc/zipos/mmap.c
+++ b/libc/zipos/mmap.c
@@ -64,7 +64,7 @@ noasan void *__zipos_Mmap(void *addr, size_t size, int prot, int flags,
 
   const int tempProt = !IsXnu() ? prot | PROT_WRITE : PROT_WRITE;
   void *outAddr =
-      Mmap(addr, size, tempProt, (flags & (~MAP_FILE)) | MAP_ANONYMOUS, -1, 0);
+      _Mmap(addr, size, tempProt, (flags & (~MAP_FILE)) | MAP_ANONYMOUS, -1, 0);
   if (outAddr == MAP_FAILED) {
     return MAP_FAILED;
   }
@@ -82,7 +82,7 @@ noasan void *__zipos_Mmap(void *addr, size_t size, int prot, int flags,
     return outAddr;
   } while (0);
   const int e = errno;
-  Munmap(outAddr, size);
+  _Munmap(outAddr, size);
   errno = e;
   strace_enabled(+1);
   return MAP_FAILED;
diff --git a/libc/zipos/zipos.mk b/libc/zipos/zipos.mk
index 66ae43e7c..89b60e0b5 100644
--- a/libc/zipos/zipos.mk
+++ b/libc/zipos/zipos.mk
@@ -40,7 +40,7 @@ LIBC_ZIPOS_A_DIRECTDEPS =				\
 	LIBC_STUBS					\
 	LIBC_SYSV_CALLS					\
 	LIBC_NT_KERNEL32				\
-	THIRD_PARTY_ZLIB
+	THIRD_PARTY_PUFF
 
 LIBC_ZIPOS_A_DEPS :=					\
 	$(call uniq,$(foreach zipos,$(LIBC_ZIPOS_A_DIRECTDEPS),$($(zipos))))
diff --git a/third_party/puff/README.cosmo b/third_party/puff/README.cosmo
new file mode 100644
index 000000000..3cde08560
--- /dev/null
+++ b/third_party/puff/README.cosmo
@@ -0,0 +1,18 @@
+DESCRIPTION
+
+  puff is a tiny implementation of deflate decompression
+
+LICENSE
+
+  zlib license
+
+ORIGIN
+
+  Origin: git@github.com:madler/zlib.git
+  Commit: 03614c56ad299f9b238c75aa1e66f0c08fc4fc8b
+  Author: Mark Adler <madler@alumni.caltech.edu>
+  Date:   Sun Oct 30 08:36:13 2016 -0700
+
+LOCAL CHANGES
+
+  None.
diff --git a/third_party/zlib/puff.c b/third_party/puff/puff.c
similarity index 99%
rename from third_party/zlib/puff.c
rename to third_party/puff/puff.c
index 8ee5576af..d79a48086 100644
--- a/third_party/zlib/puff.c
+++ b/third_party/puff/puff.c
@@ -23,7 +23,7 @@
 │  Mark Adler    madler@alumni.caltech.edu                                     │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/runtime/runtime.h"
-#include "third_party/zlib/puff.h"
+#include "third_party/puff/puff.h"
 // clang-format off
 
 asm(".ident\t\"\\n\\n\
@@ -825,10 +825,10 @@ local int dynamic(struct state *s)
  *   block (if it was a fixed or dynamic block) are undefined and have no
  *   expected values to check.
  */
-int puff(unsigned char *dest,           /* pointer to destination pointer */
-         unsigned long *destlen,        /* amount of output space */
-         const unsigned char *source,   /* pointer to source data pointer */
-         unsigned long *sourcelen)      /* amount of input available */
+int _puff(unsigned char *dest,           /* pointer to destination pointer */
+          unsigned long *destlen,        /* amount of output space */
+          const unsigned char *source,   /* pointer to source data pointer */
+          unsigned long *sourcelen)      /* amount of input available */
 {
     struct state s;             /* input/output state */
     int last, type;             /* block information */
diff --git a/third_party/zlib/puff.h b/third_party/puff/puff.h
similarity index 74%
rename from third_party/zlib/puff.h
rename to third_party/puff/puff.h
index 7900fd9f4..fd00f6f4b 100644
--- a/third_party/zlib/puff.h
+++ b/third_party/puff/puff.h
@@ -7,8 +7,8 @@ COSMOPOLITAN_C_START_
 #define NIL ((unsigned char *)0) /* for no output option */
 #endif
 
-int puff(unsigned char *dest, unsigned long *destlen,
-         const unsigned char *source, unsigned long *sourcelen);
+int _puff(unsigned char *dest, unsigned long *destlen,
+          const unsigned char *source, unsigned long *sourcelen);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
diff --git a/third_party/puff/puff.mk b/third_party/puff/puff.mk
new file mode 100644
index 000000000..e5f660cdf
--- /dev/null
+++ b/third_party/puff/puff.mk
@@ -0,0 +1,45 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += THIRD_PARTY_PUFF
+
+THIRD_PARTY_PUFF_ARTIFACTS += THIRD_PARTY_PUFF_A
+THIRD_PARTY_PUFF = $(THIRD_PARTY_PUFF_A_DEPS) $(THIRD_PARTY_PUFF_A)
+THIRD_PARTY_PUFF_A = o/$(MODE)/third_party/puff/puff.a
+THIRD_PARTY_PUFF_A_FILES := $(wildcard third_party/puff/*)
+THIRD_PARTY_PUFF_A_HDRS = $(filter %.h,$(THIRD_PARTY_PUFF_A_FILES))
+THIRD_PARTY_PUFF_A_SRCS = $(filter %.c,$(THIRD_PARTY_PUFF_A_FILES))
+
+THIRD_PARTY_PUFF_A_OBJS =			\
+	$(THIRD_PARTY_PUFF_A_SRCS:%.c=o/$(MODE)/%.o)
+
+THIRD_PARTY_PUFF_A_CHECKS =			\
+	$(THIRD_PARTY_PUFF_A).pkg		\
+	$(THIRD_PARTY_PUFF_A_HDRS:%=o/$(MODE)/%.ok)
+
+THIRD_PARTY_PUFF_A_DIRECTDEPS =			\
+	LIBC_INTRIN				\
+	LIBC_NEXGEN32E				\
+	LIBC_STUBS
+
+THIRD_PARTY_PUFF_A_DEPS :=			\
+	$(call uniq,$(foreach x,$(THIRD_PARTY_PUFF_A_DIRECTDEPS),$($(x))))
+
+$(THIRD_PARTY_PUFF_A):				\
+		third_party/puff/		\
+		$(THIRD_PARTY_PUFF_A).pkg	\
+		$(THIRD_PARTY_PUFF_A_OBJS)
+
+$(THIRD_PARTY_PUFF_A).pkg:			\
+		$(THIRD_PARTY_PUFF_A_OBJS)	\
+		$(foreach x,$(THIRD_PARTY_PUFF_A_DIRECTDEPS),$($(x)_A).pkg)
+
+THIRD_PARTY_PUFF_LIBS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)))
+THIRD_PARTY_PUFF_SRCS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_SRCS))
+THIRD_PARTY_PUFF_HDRS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_HDRS))
+THIRD_PARTY_PUFF_CHECKS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_CHECKS))
+THIRD_PARTY_PUFF_OBJS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_OBJS))
+
+.PHONY: o/$(MODE)/third_party/puff
+o/$(MODE)/third_party/puff:			\
+		$(THIRD_PARTY_PUFF_CHECKS)
diff --git a/third_party/third_party.mk b/third_party/third_party.mk
index 6788db814..570d1715f 100644
--- a/third_party/third_party.mk
+++ b/third_party/third_party.mk
@@ -23,6 +23,7 @@ o/$(MODE)/third_party:				\
 	o/$(MODE)/third_party/mbedtls		\
 	o/$(MODE)/third_party/musl		\
 	o/$(MODE)/third_party/nsync		\
+	o/$(MODE)/third_party/puff		\
 	o/$(MODE)/third_party/python		\
 	o/$(MODE)/third_party/quickjs		\
 	o/$(MODE)/third_party/regex		\
diff --git a/tool/build/pledge.c b/tool/build/pledge.c
index a54f426f6..a15cbcb07 100644
--- a/tool/build/pledge.c
+++ b/tool/build/pledge.c
@@ -673,7 +673,7 @@ int main(int argc, char *argv[]) {
   }
 
   // figure out where we want the dso
-  if (IsDynamicExecutable(prog)) {
+  if (_IsDynamicExecutable(prog)) {
     isdynamic = true;
     if ((s = getenv("TMPDIR")) ||  //
         (s = getenv("HOME")) ||    //
diff --git a/tool/net/redbean.c b/tool/net/redbean.c
index 4fd65a576..405575624 100644
--- a/tool/net/redbean.c
+++ b/tool/net/redbean.c
@@ -6893,7 +6893,7 @@ static void MakeExecutableModifiable(void) {
   if (_endswith(zpath, ".com.dbg")) return;
   close(zfd);
   ft = ftrace_enabled(0);
-  if ((zfd = OpenExecutable()) == -1) {
+  if ((zfd = _OpenExecutable()) == -1) {
     WARNF("(srvr) can't open executable for modification: %m");
   }
   if (ft > 0) {