Build issues on Fedora 20

[eklitzke]

On Fedora 20, I need this patch to get it to build:

diff --git a/configure.ac b/configure.ac
index c1d5bc3..d6aa642 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,6 +11,8 @@ AC_CHECK_LIB([crypto], [EVP_MD_CTX_init])
 AC_CHECK_LIB([ev], [ev_run])
 AC_CHECK_LIB([m], [floor])
 AC_CHECK_LIB([glib-2.0], [g_hash_table_new])
+AM_PROG_CC_C_O
 PKG_CHECK_MODULES([GLIB], [glib-2.0])
+PKG_CHECK_MODULES([libev], [libev >= 4.11])
 AC_REVISION([m4_esyscmd_s([git describe --always])])
 AC_OUTPUT
diff --git a/src/Makefile.am b/src/Makefile.am
index 8d21f51..63db0fe 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,4 +1,4 @@
-AM_CFLAGS=-O2 -g -std=c99 -pedantic -Wall -fno-strict-aliasing -D_XOPEN_SOURCE=700 -D_DEFAULT_SOURCE $(GLIB_CFLAGS)
+AM_CFLAGS=-O2 -g -std=c99 -pedantic -Wall -fno-strict-aliasing -D_XOPEN_SOURCE=700 -D_DEFAULT_SOURCE $(GLIB_CFLAGS) $(libev_CFLAGS)
 AM_LDFLAGS=-lcrypto -lev -lm $(GLIB_LDFLAGS)
 bin_PROGRAMS=statsrelay stathasher
 statsrelay_SOURCES=buffer.c ketama.c log.c protocol.c tcpclient.c tcpserver.c udpserver.c stats.c validate.c main.c

The issue is that on Debian the headers to go /usr/include but on Fedora 20 they're in /usr/include/libev. The check for AM_PROG_CC_C_O is needed for older versions of autoconf.

This is all fine and well, but this change breaks Debian because Debian doesn't have a pkg-config file for libev. I don't know enough about autoconf to know how to correctly fix this so that it builds on Ubuntu, Debian, and Fedora.