--- unix/configure.orig	2008-06-20 03:32:20 UTC
+++ unix/configure
@@ -98,7 +98,6 @@ int main()
 _EOF_
       $CC $CFLAGS -c conftest.c > /dev/null 2>/dev/null
       if test $? -eq 0; then
-        CFLAGS_OPT='-O3'
         echo "  GNU C ($CFLAGS_OPT)"
         # Special Mac OS X shared library "ld" option?
         if test ` uname -s 2> /dev/null ` = 'Darwin'; then
@@ -110,7 +109,6 @@ _EOF_
           rm -f conftest
         fi
       else
-        CFLAGS_OPT='-O'
         echo "  Other-unknown C ($CFLAGS_OPT)"
       fi
     fi
@@ -224,7 +222,6 @@ CPP="${CC} -E"
 [ -f /usr/ccs/lib/cpp ] && CPP="/usr/ccs/lib/cpp -P"
 [ -f /usr/lib/cpp ] && CPP=/usr/lib/cpp
 [ -f /lib/cpp ] && CPP=/lib/cpp
-[ -f /usr/bin/cpp ] && CPP=/usr/bin/cpp
 [ -f /xenix ] && CPP="${CC} -E"
 [ -f /lynx.os ] && CPP="${CC} -E"
 
@@ -244,7 +241,7 @@ if eval "$CPP match.S > _match.s 2>/dev/null"; then
     echo "int foo() { return 0;}" > conftest.c
     $CC -c conftest.c >/dev/null 2>/dev/null
     echo Check if compiler generates underlines
-    nm conftest.o | grep "(^|[^_])foo" >/dev/null 2>/dev/null
+    nm conftest.o | egrep "(^|[^_])foo" >/dev/null 2>/dev/null
     [ $? -eq 0 ] && CPP="${CPP} -DNO_UNDERLINE"
     if eval "$CPP crc_i386.S > _crc_i386.s 2>/dev/null"; then
       if eval "$CC -c _crc_i386.s >/dev/null 2>/dev/null" && [ -f _crc_i386.o ]
@@ -519,7 +516,10 @@ done
 
 
 echo Check for memset
-echo "int main(){ char k; memset(&k,0,0); return 0; }" > conftest.c
+cat > conftest.c << _EOF_
+#include <string.h>
+int main(){ char k; memset(&k,0,0); return 0; }
+_EOF_
 $CC -o conftest conftest.c >/dev/null 2>/dev/null
 [ $? -ne 0 ] && CFLAGS="${CFLAGS} -DZMEM"
 
@@ -556,6 +556,7 @@ $CC $CFLAGS -c conftest.c >/dev/null 2>/dev/null
 
 echo Check for directory libraries
 cat > conftest.c << _EOF_
+#include <dirent.h>
 int main() { return closedir(opendir(".")); }
 _EOF_
 
@@ -578,7 +579,10 @@ fi
 # Dynix/ptx 1.3 needed this
 
 echo Check for readlink
-echo "int main(){ return readlink(); }" > conftest.c
+cat > conftest.c << _EOF_
+#include <unistd.h>
+int main() { return readlink(); }
+_EOF_
 $CC -o conftest conftest.c >/dev/null 2>/dev/null
 if [ $? -ne 0 ]; then
   $CC -o conftest conftest.c -lseq >/dev/null 2>/dev/null
@@ -621,6 +625,7 @@ CFLAGS="${CFLAGS} ${OPT}"
 
 echo Check for valloc
 cat > conftest.c << _EOF_
+#include <unistd.h>
 main()
 {
 #ifdef MMAP