gentoo-overlay/net-libs/libsrtp/files/libsrtp-pcap-automagic-r0.patch

--- a/configure.in	2015-03-25 15:37:31.953386365 +0000
+++ b/configure.in	2015-03-25 15:39:49.192183689 +0000
@@ -182,6 +182,8 @@
 AC_SUBST(HMAC_OBJS)
 
 dnl Checking for PCAP
+AC_ARG_ENABLE([pcap], AS_HELP_STRING([--disable-pcap], [Build without `pcap' library (-lpcap)]))
+AS_IF([test "x$enable_pcap" != "xno"], [
 AC_CHECK_LIB([pcap],[pcap_create],
     [PCAP=1
      LIBS="-lpcap $LIBS"
@@ -189,6 +191,7 @@
      AC_DEFINE(HAVE_PCAP, 1, [Define to 1 if you have the `pcap' library (-lpcap)])
      AC_SUBST(HAVE_PCAP)
 ])
+])
 
 AC_MSG_CHECKING(whether to use syslog for error reporting)
 AC_ARG_ENABLE(syslog,