[3405] Compilation fixes

src/bin/dhcp4/Makefile.am

@@ -76,6 +76,7 @@ b10_dhcp4_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
 b10_dhcp4_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
 b10_dhcp4_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
 b10_dhcp4_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+b10_dhcp4_LDADD += $(top_builddir)/src/lib/util/io/libkea-util-io.la
 
 b10_dhcp4dir = $(pkgdatadir)
 b10_dhcp4_DATA = dhcp4.spec

src/bin/dhcp4/tests/Makefile.am

@@ -136,6 +136,7 @@ dhcp4_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
 dhcp4_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
 dhcp4_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
 dhcp4_unittests_LDADD += $(top_builddir)/src/lib/dhcpsrv/testutils/libdhcpsrvtest.la
+dhcp4_unittests_LDADD += $(top_builddir)/src/lib/util/io/libkea-util-io.la
 endif
 
 noinst_EXTRA_DIST = configs-list.txt

src/lib/util/io/signal_set.cc

@@ -14,6 +14,7 @@
 
 #include <util/io/signal_set.h>
 
+#include <cerrno>
 #include <list>
 
 using namespace isc;