Change ngrep's build system to use the system's version of PCRE.

---
 Makefile.in  |    6 ++----
 configure    |   11 +++--------
 configure.in |   11 +++--------
 ngrep.c      |    2 +-
 4 files changed, 9 insertions(+), 21 deletions(-)

--- a/configure
+++ b/configure
@@ -3624,13 +3624,10 @@
 
 if test $use_pcre = yes; then
 
-  echo
-  echo 'Configuring Perl-Compatible Regular Expression (PCRE) library ...'
-  echo
-
-  REGEX_DIR='pcre-5.0'
-  REGEX_OBJS="$REGEX_DIR/pcre.o $REGEX_DIR/study.o"
+  REGEX_DIR=''
+  REGEX_OBJS=""
   USE_PCRE="1"
+  EXTRA_LIBS="$EXTRA_LIBS -lpcre"
 
 else
 
@@ -3644,8 +3641,6 @@
 
 fi
 
-( cd $REGEX_DIR && ./configure )
-
 
 
 
--- a/configure.in
+++ b/configure.in
@@ -126,13 +126,10 @@
 
 if test $use_pcre = yes; then
 
-  echo 
-  echo 'Configuring Perl-Compatible Regular Expression (PCRE) library ...' 
-  echo 
-
-  REGEX_DIR='pcre-5.0'
-  REGEX_OBJS="$REGEX_DIR/pcre.o $REGEX_DIR/study.o"
+  REGEX_DIR=''
+  REGEX_OBJS=""
   USE_PCRE="1"
+  EXTRA_LIBS="$EXTRA_LIBS -lpcre"
 
 else
 
@@ -146,8 +143,6 @@
 
 fi
 
-( cd $REGEX_DIR && ./configure )
-
 AC_SUBST(REGEX_DIR)
 AC_SUBST(REGEX_OBJS)
 
--- a/Makefile.in
+++ b/Makefile.in
@@ -7,7 +7,7 @@
 
 CC=@CC@
 
-CFLAGS=@CFLAGS@ -D@OS@ @DEFS@ @EXTRA_DEFINES@ 
+CFLAGS=@CFLAGS@ @CPPFLAGS@ -D@OS@ @DEFS@ @EXTRA_DEFINES@ 
 INCLUDES=-I@srcdir@ @PCAP_INCLUDE@ @EXTRA_INCLUDES@
 
 LDFLAGS=@LDFLAGS@ @PCAP_LINK@
@@ -39,13 +39,13 @@
 all: $(TARGET) 
 
 $(TARGET): $(REGEX_OBJS) $(OBJS) 
-	$(CC) $(CFLAGS) $(LDFLAGS) $(STRIPFLAG) -o $(TARGET) $(OBJS) $(REGEX_OBJS) $(LIBS) 
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(TARGET) $(OBJS) $(REGEX_OBJS) $(LIBS) 
 
 debug: $(REGEX_OBJS) $(OBJS)
 	$(CC) $(CFLAGS) $(LDFLAGS) -g -o $(TARGET) $(OBJS) $(REGEX_OBJS) $(LIBS) 
 
 static: $(REGEX_OBJS) $(OBJS)
-	$(CC) $(CFLAGS) $(LDFLAGS) $(STRIPFLAG) -o $(TARGET).static -static $(OBJS) $(REGEX_OBJS) $(LIBS) 
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(TARGET).static -static $(OBJS) $(REGEX_OBJS) $(LIBS) 
 
 install: $(TARGET)
 	$(INSTALL) -c -m 0755 $(TARGET)  $(DESTDIR)/$(BINDIR_INSTALL)/$(TARGET)
@@ -55,11 +55,9 @@
 	$(CC) $(CFLAGS) $(INCLUDES) -g -c $<
 
 clean:
-	make -C $(REGEX_DIR) clean
 	rm -f *~ $(OBJS) $(REGEX_OBJS) $(TARGET) $(TARGET).static
 
 distclean: clean 
-	make -C $(REGEX_DIR) distclean
 	rm -f config.status config.cache config.log config.h Makefile 
 
 $(REGEX_OBJS): $(REGEX_OBJS:.o=.c) $(REGEX_DIR)/*.h
--- a/ngrep.c
+++ b/ngrep.c
@@ -92,7 +92,7 @@
 #endif
 
 #if USE_PCRE
-#include "pcre-5.0/pcre.h"
+#include <pcre.h>
 #else
 #include "regex-0.12/regex.h"
 #endif