diff -r 6e8f42fa4a86 Lib/ctypes/util.py
--- a/Lib/ctypes/util.py	Tue Oct 14 23:03:13 2014 +0200
+++ b/Lib/ctypes/util.py	Wed Oct 15 00:31:27 2014 +0200
@@ -1,6 +1,8 @@
-import sys, os
 import contextlib
+import os
+import shutil
 import subprocess
+import sys
 
 # find_library(name) returns the pathname of a library, or None.
 if os.name == "nt":
@@ -88,28 +90,36 @@ elif os.name == "posix":
     import re, tempfile
 
     def _findLib_gcc(name):
-        expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
-        fdout, ccout = tempfile.mkstemp()
-        os.close(fdout)
-        cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit 10; fi;' \
-              'LANG=C LC_ALL=C $CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
-        try:
-            f = os.popen(cmd)
+        expr = os.fsencode(r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % name)
+
+        if shutil.which('gcc'):
+            c_compiler = 'gcc'
+        elif shutil.which('cc'):
+            c_compiler = 'cc'
+        else:
+            raise OSError('gcc or cc command not found')
+
+        with tempfile.NamedTemporaryFile() as temp:
+            args = [c_compiler, '-Wl,-t', '-l', name, '-o', temp.name]
+
+            env = os.environ.copy()
+            env['LC_ALL'] = 'C'
+            env['LANG'] = 'C'
+            proc = subprocess.Popen(args,
+                                    stdout=subprocess.PIPE,
+                                    stderr=subprocess.DEVNULL,
+                                    env=env)
+            with proc:
+                trace = proc.stdout.read()
+
             try:
-                trace = f.read()
-            finally:
-                rv = f.close()
-        finally:
-            try:
-                os.unlink(ccout)
+                temp.close()
             except FileNotFoundError:
                 pass
-        if rv == 10:
-            raise OSError('gcc or cc command not found')
         res = re.search(expr, trace)
         if not res:
             return None
-        return res.group(0)
+        return os.fsdecode(res.group(0))
 
 
     if sys.platform == "sunos5":
@@ -129,19 +139,17 @@ elif os.name == "posix":
             # assuming GNU binutils / ELF
             if not f:
                 return None
-            cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
-                  "objdump -p -j .dynamic 2>/dev/null " + f
-            f = os.popen(cmd)
-            try:
-                dump = f.read()
-            finally:
-                rv = f.close()
-            if rv == 10:
+            if not shutil.which('objdump'):
                 raise OSError('objdump command not found')
-            res = re.search(r'\sSONAME\s+([^\s]+)', dump)
+            proc = subprocess.Popen(['objdump', '-p', '-j', '.dynamic', f],
+                                    stdout=subprocess.PIPE,
+                                    stderr=subprocess.DEVNULL)
+            with proc:
+                dump = proc.stdout.read()
+            res = re.search(br'\sSONAME\s+([^\s]+)', dump)
             if not res:
                 return None
-            return res.group(1)
+            return os.fsdecode(res.group(1))
 
     if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):