--- zlib/configure
+++ zlib/configure
@@ -160,8 +160,8 @@
 if test $shared -eq 1; then
   echo Checking for shared library support...
   # we must test in two steps (cc then ld), required at least on SunOS 4.x
-  if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&
-     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then
+  if ($CC -c $SFLAGS $test.c) 2>>config.log &&
+     ($LDSHARED -o $test$shared_ext $test.o) 2>>config.log; then
     CFLAGS="$SFLAGS"
     LIBS="$LIBS $SHAREDLIBV"
     echo Building shared library $SHAREDLIBV with $CC.
@@ -185,7 +185,7 @@
 #include <unistd.h>
 int main() { return 0; }
 EOF
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if ($CC -c $CFLAGS $test.c) 2>>config.log; then
   sed < zconf.in.h "/HAVE_UNISTD_H/s%0%1%" > zconf.h
   echo "Checking for unistd.h... Yes."
 else
@@ -208,7 +208,7 @@
 }
 EOF
 
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if ($CC -c $CFLAGS $test.c) 2>>config.log; then
   echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()"
 
   cat > $test.c <<EOF
@@ -232,7 +232,7 @@
 }
 EOF
 
-  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then
+  if ($CC $CFLAGS -o $test $test.c) 2>>config.log; then
     echo "Checking for vsnprintf() in stdio.h... Yes."
 
     cat >$test.c <<EOF
@@ -257,7 +257,7 @@
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if ($CC -c $CFLAGS $test.c) 2>>config.log; then
       echo "Checking for return value of vsnprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_vsnprintf_void"
@@ -295,7 +295,7 @@
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if ($CC -c $CFLAGS $test.c) 2>>config.log; then
       echo "Checking for return value of vsprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_vsprintf_void"
@@ -325,7 +325,7 @@
 }
 EOF
 
-  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then
+  if ($CC $CFLAGS -o $test $test.c) 2>>config.log; then
     echo "Checking for snprintf() in stdio.h... Yes."
 
     cat >$test.c <<EOF
@@ -344,7 +344,7 @@
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if ($CC -c $CFLAGS $test.c) 2>>config.log; then
       echo "Checking for return value of snprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_snprintf_void"
@@ -376,7 +376,7 @@
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if ($CC -c $CFLAGS $test.c) 2>>config.log; then
       echo "Checking for return value of sprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_sprintf_void"
@@ -392,7 +392,7 @@
 #include <errno.h>
 int main() { return 0; }
 EOF
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if ($CC -c $CFLAGS $test.c) 2>>config.log; then
   echo "Checking for errno.h... Yes."
 else
   echo "Checking for errno.h... No."
@@ -407,7 +407,7 @@
   return mmap((caddr_t)0, (off_t)0, PROT_READ, MAP_SHARED, 0, (off_t)0);
 }
 EOF
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if ($CC -c $CFLAGS $test.c) 2>>config.log; then
   CFLAGS="$CFLAGS -DUSE_MMAP"
   echo Checking for mmap support... Yes.
 else