diff -ur a/configure.in b/configure.in
--- a/configure.in	2012-12-21 15:26:49.000000000 +0100
+++ b/configure.in	2013-06-18 17:38:10.292436508 +0200
@@ -779,6 +779,8 @@
 AC_SUBST(WANPIPE_FLAGS)
 
 HAVE_SOUNDCARD=no
+AC_ARG_ENABLE(oss,AC_HELP_STRING([--enable-oss],[Enable OSS (default: yes)]),enable_oss=$enableval,enable_oss=yes)
+if [[ "x$enable_oss" = "xyes" ]]; then
 AC_MSG_CHECKING([for sound card headers])
 AC_TRY_COMPILE([
 #include <sys/stat.h>
@@ -797,9 +799,12 @@
 HAVE_SOUNDCARD="yes"
 )
 AC_MSG_RESULT([$HAVE_SOUNDCARD])
+fi
 AC_SUBST(HAVE_SOUNDCARD)
 
 HAVE_ALSA=no
+AC_ARG_ENABLE(alsa,AC_HELP_STRING([--enable-alsa],[Enable ALSA (default: yes)]),enable_alsa=$enableval,enable_alsa=yes)
+if [[ "x$enable_alsa" = "xyes" ]]; then
 AC_MSG_CHECKING([for ALSA headers])
 AC_TRY_COMPILE([
 #if defined(__linux__)
@@ -816,6 +821,7 @@
 HAVE_ALSA="yes"
 )
 AC_MSG_RESULT([$HAVE_ALSA])
+fi
 AC_SUBST(HAVE_ALSA)
 
 # check for Mac OS X audio headers
@@ -878,20 +884,36 @@
 
 HAVE_ILBC=no
 ILBC_INC=""
-AC_ARG_ENABLE(ilbc,AC_HELP_STRING([--enable-ilbc],[Enable iLBC codec (default: yes)]),want_ilbc=$enableval,want_ilbc=yes)
-if [[ "x$want_ilbc" = "xyes" ]]; then
-AC_MSG_CHECKING([for iLBC reference in libs])
-	basedir=`cd "$srcdir" && pwd`
-	incilbc="libs/ilbc"
-        if [[ -f "$basedir/$incilbc/iLBC_encode.h" ]]; then
+SYSTEM_ILBC=no
+AC_ARG_ENABLE(ilbc,AC_HELP_STRING([--enable-ilbc],[Enable iLBC codec (default: yes)]),ac_cv_use_ilbc=$enableval,ac_cv_use_ilbc=yes)
+if [[ "x$ac_cv_use_ilbc" = "xyes" ]]; then
+	for i in /usr/include /usr/include/ilbc /usr/local/include /usr/local/include/ilbc; do
+		ac_cv_use_ilbc="$i"
+		test -f "$ac_cv_use_ilbc/iLBC_encode.h" && break
+	done
+fi
+if [[ "x$ac_cv_use_ilbc" != "xno" ]]; then
+	AC_MSG_CHECKING([for iLBC_encode.h in $ac_cv_use_ilbc])
+	if [[ -f "$ac_cv_use_ilbc/iLBC_encode.h" ]]; then
+		HAVE_ILBC=yes
+		ILBC_INC="-I$ac_cv_use_ilbc"
+		SYSTEM_ILBC=yes
+	else
+		AC_MSG_CHECKING([for iLBC in libs])
+		basedir=`cd "$srcdir" && pwd`
+		incilbc="libs/ilbc"
+		if [[ -f "$basedir/$incilbc/iLBC_encode.h" ]]; then
 		HAVE_ILBC=yes
 		basedir=`echo "$basedir" | sed 's/\([[^\]]\)\([[[:space:]\$\"'\'']]\)/\1\\\2/g'`
 		ILBC_INC="-I$basedir/$incilbc"
+		SYSTEM_ILBC=no
 	fi
+fi
 AC_MSG_RESULT([$HAVE_ILBC])
 fi
 AC_SUBST(HAVE_ILBC)
 AC_SUBST(ILBC_INC)
+AC_SUBST(SYSTEM_ILBC)
 
 HAVE_ILBCWR=no
 ILBCWR_INC=""
Nur in b: configure.in.orig.
diff -ur a/modules/Makefile.in b/modules/Makefile.in
--- a/modules/Makefile.in	2012-12-21 15:26:49.000000000 +0100
+++ b/modules/Makefile.in	2013-06-18 17:38:10.292436508 +0200
@@ -344,9 +344,13 @@
 server/lksctp.yate: EXTERNFLAGS = @SCTP_FLAGS@
 server/lksctp.yate: EXTERNLIBS = -lsctp
 
+ifeq (@SYSTEM_ILBC@,yes)
+ilbccodec.yate: LOCALLIBS = -lilbc
+else
 ilbccodec.yate: ../libs/ilbc/libilbc.a
-ilbccodec.yate: LOCALFLAGS = @ILBC_INC@
 ilbccodec.yate: LOCALLIBS = -L../libs/ilbc -lilbc
+endif
+ilbccodec.yate: LOCALFLAGS = @ILBC_INC@
 
 ilbcwebrtc.yate: ../libs/miniwebrtc/libminiwebrtc.a
 ilbcwebrtc.yate: LOCALFLAGS = @ILBCWR_INC@ -I@top_srcdir@/libs/miniwebrtc/audio/common/processing -I@top_srcdir@/libs/miniwebrtc
Nur in b/modules: Makefile.in.orig.