Make pcap dependency optional
Previously we required pcap.h unconditionally which causes embedded
build failure because it's not included in current version of out poky
toolchain. We can add it to toolchain but it's only necessary for
utils/osmo-meas-pcap2db which is not built for sysmobts anyway so it's
easier to just make this dependency optional and build osmo-meas-pcap2db
only if it's available - similar to the way we build osmo-meas-udp2db.
Related: SYS#3610
Change-Id: I77a5f7eafe0282abedacffad6a9bcb0a8f2b5caa
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 7e244bc..c6ae159 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -120,7 +120,10 @@
dnl checks for header files
AC_HEADER_STDC
AC_CHECK_HEADERS(dbi/dbd.h,,AC_MSG_ERROR(DBI library is not installed))
-AC_CHECK_HEADERS(pcap/pcap.h,,AC_MSG_ERROR(PCAP library is not installed))
+
+found_pcap=yes
+AC_CHECK_HEADERS(pcap/pcap.h,,found_pcap=no)
+AM_CONDITIONAL(HAVE_PCAP, test "$found_pcap" = yes)
found_cdk=yes
AC_CHECK_HEADERS(cdk/cdk.h,,found_cdk=no)