Different way of determining if pcap_breakloop exists

tools/pcapper/GNUmakefile.in

@@ -9,7 +9,6 @@ TESTBED_SRCDIR  = @top_srcdir@
 OBJDIR          = ../..
 SUBDIR          = tools/pcapper
 SYSTEM	       := $(shell uname -s)
-RHLVERSION     := $(shell cat /etc/redhat-release | sed -e 's/Red Hat Linux release \([0-9]\).*/Linux\1/' | sed -e 's/Fedora Core release \([0-9]\).*/FC\1/')
 
 include $(OBJDIR)/Makeconf
 
@@ -39,18 +38,31 @@ LDFLAGS = $(LDSTATIC)
 CFLAGS_FBSD    = $(CFLAGS) $(TBCFLAGS)
 CFLAGS_FBSD_NE = $(CFLAGS)
 CFLAGS_LINUX   = $(CFLAGS) -I/usr/include/pcap $(TBCFLAGS)
-ifneq (,$(findstring FC, $(RHLVERSION)))
-# XXX should be configed
-CFLAGS_LINUX  += -DHAVE_PCAP_BREAKLOOP
-endif
 
 LIBS_FBSD      = $(PTHREADLIBS) $(TBLIBS) $(PCAPLIBS)
 LIBS_FBSD_NE   = $(PTHREADLIBS) $(PCAPLIBS)
+LIBS_LINUX     = -L/usr/lib -lpthread -lpcap $(TBLIBS) -ldl -lz
+
+#
+# XXX dynamically-determined Linux stuff, only do on Linux
+#
+ifeq ($(SYSTEM),Linux)
+ifneq ($(wildcard /usr/lib/libpcap.a),)
+NOPBL := $(shell nm /usr/lib/libpcap.a | grep -q pcap_breakloop; echo $$?)
+else
+NOPBL := 1
+endif
+ifeq ($(NOPBL),0)
+CFLAGS_LINUX  += -DHAVE_PCAP_BREAKLOOP
+endif
+ifneq ($(wildcard /usr/kerberos/bin/krb5-config),)
 LIBS_LINUX     = -L/usr/lib -lpthread -lpcap $(TBLIBS) \
 		 `/usr/kerberos/bin/krb5-config --libs krb5` -ldl -lz
 ifneq ($(wildcard /usr/lib/libkrb5support.a),)
 LIBS_LINUX    += -lkrb5support
 endif
+endif
+endif
 
 # virtual (encapsulated) ethernet
 #CFLAGS_FBSD   += -DVETH