diff -aruN iperf-2.0.5/configure iperf-2.0.5.N/configure
--- iperf-2.0.5/configure	2010-04-10 12:23:05.000000000 -0700
+++ iperf-2.0.5.N/configure	2015-04-07 12:21:45.087517553 -0700
@@ -7247,7 +7247,7 @@
 
 
 if test "$ac_cv_multicast" != no; then
-  ac_fn_c_check_type "$LINENO" "struct ip_mreq" "ac_cv_type_struct_ip_mreq" "#include \"compat/headers_slim.h\"
+  ac_fn_c_check_type "$LINENO" "struct ip_mreq" "ac_cv_type_struct_ip_mreq" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_type_struct_ip_mreq" = x""yes; then :
 
@@ -7258,7 +7258,7 @@
 
 fi
 
-  ac_fn_c_check_decl "$LINENO" "IP_ADD_MEMBERSHIP" "ac_cv_have_decl_IP_ADD_MEMBERSHIP" "#include \"compat/headers_slim.h\"
+  ac_fn_c_check_decl "$LINENO" "IP_ADD_MEMBERSHIP" "ac_cv_have_decl_IP_ADD_MEMBERSHIP" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_have_decl_IP_ADD_MEMBERSHIP" = x""yes; then :
   ac_have_decl=1
@@ -7288,7 +7288,7 @@
 fi
 
 if test "$ac_cv_have_ipv6" != no; then
-  ac_fn_c_check_type "$LINENO" "struct sockaddr_storage" "ac_cv_type_struct_sockaddr_storage" "#include \"compat/headers_slim.h\"
+  ac_fn_c_check_type "$LINENO" "struct sockaddr_storage" "ac_cv_type_struct_sockaddr_storage" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_type_struct_sockaddr_storage" = x""yes; then :
 
@@ -7299,7 +7299,7 @@
 
 fi
 
-  ac_fn_c_check_type "$LINENO" "struct sockaddr_in6" "ac_cv_type_struct_sockaddr_in6" "#include \"compat/headers_slim.h\"
+  ac_fn_c_check_type "$LINENO" "struct sockaddr_in6" "ac_cv_type_struct_sockaddr_in6" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_type_struct_sockaddr_in6" = x""yes; then :
 
@@ -7310,7 +7310,7 @@
 
 fi
 
-  ac_fn_c_check_decl "$LINENO" "AF_INET6" "ac_cv_have_decl_AF_INET6" "#include \"compat/headers_slim.h\"
+  ac_fn_c_check_decl "$LINENO" "AF_INET6" "ac_cv_have_decl_AF_INET6" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_have_decl_AF_INET6" = x""yes; then :
   ac_have_decl=1
@@ -7341,7 +7341,7 @@
 
 if test "$ac_cv_have_ipv6" = yes; then
   if test "$ac_cv_multicast" = yes; then
-    ac_fn_c_check_type "$LINENO" "struct ipv6_mreq" "ac_cv_type_struct_ipv6_mreq" "#include \"compat/headers_slim.h\"
+    ac_fn_c_check_type "$LINENO" "struct ipv6_mreq" "ac_cv_type_struct_ipv6_mreq" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_type_struct_ipv6_mreq" = x""yes; then :
 
@@ -7352,7 +7352,7 @@
 
 fi
 
-    ac_fn_c_check_decl "$LINENO" "IPV6_ADD_MEMBERSHIP" "ac_cv_have_decl_IPV6_ADD_MEMBERSHIP" "#include \"compat/headers_slim.h\"
+    ac_fn_c_check_decl "$LINENO" "IPV6_ADD_MEMBERSHIP" "ac_cv_have_decl_IPV6_ADD_MEMBERSHIP" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_have_decl_IPV6_ADD_MEMBERSHIP" = x""yes; then :
   ac_have_decl=1
@@ -7364,7 +7364,7 @@
 #define HAVE_DECL_IPV6_ADD_MEMBERSHIP $ac_have_decl
 _ACEOF
 
-    ac_fn_c_check_decl "$LINENO" "IPV6_MULTICAST_HOPS" "ac_cv_have_decl_IPV6_MULTICAST_HOPS" "#include \"compat/headers_slim.h\"
+    ac_fn_c_check_decl "$LINENO" "IPV6_MULTICAST_HOPS" "ac_cv_have_decl_IPV6_MULTICAST_HOPS" "#include \"${srcdir}/compat/headers_slim.h\"
 "
 if test "x$ac_cv_have_decl_IPV6_MULTICAST_HOPS" = x""yes; then :
   ac_have_decl=1
diff -aruN iperf-2.0.5/configure.ac iperf-2.0.5.N/configure.ac
--- iperf-2.0.5/configure.ac	2010-04-10 12:23:05.000000000 -0700
+++ iperf-2.0.5.N/configure.ac	2015-04-07 15:43:06.422566931 -0700
@@ -176,8 +176,8 @@
 
 dnl check for multicast
 if test "$ac_cv_multicast" != no; then
-  AC_CHECK_TYPES(struct ip_mreq,,,[#include "compat/headers_slim.h"])
-  AC_CHECK_DECLS(IP_ADD_MEMBERSHIP,,,[#include "compat/headers_slim.h"])
+  AC_CHECK_TYPES(struct ip_mreq,,,[#include "${srcdir}/compat/headers_slim.h"])
+  AC_CHECK_DECLS(IP_ADD_MEMBERSHIP,,,[#include "${srcdir}/compat/headers_slim.h"])
   AC_MSG_CHECKING(for multicast support)
   ac_cv_multicast=no
   if test "$ac_cv_have_decl_IP_ADD_MEMBERSHIP" = yes; then
@@ -193,9 +193,9 @@
 
 dnl check for IPv6
 if test "$ac_cv_have_ipv6" != no; then
-  AC_CHECK_TYPES(struct sockaddr_storage,,,[#include "compat/headers_slim.h"])
-  AC_CHECK_TYPES(struct sockaddr_in6,,,[#include "compat/headers_slim.h"])
-  AC_CHECK_DECLS(AF_INET6,,,[#include "compat/headers_slim.h"])
+  AC_CHECK_TYPES(struct sockaddr_storage,,,[#include "${srcdir}/compat/headers_slim.h"])
+  AC_CHECK_TYPES(struct sockaddr_in6,,,[#include "${srcdir}/compat/headers_slim.h"])
+  AC_CHECK_DECLS(AF_INET6,,,[#include "${srcdir}/compat/headers_slim.h"])
   AC_MSG_CHECKING(for IPv6 headers and structures)
   ac_cv_have_ipv6=no
   if test "$ac_cv_type_struct_sockaddr_storage" = yes; then
@@ -211,9 +211,9 @@
 
 if test "$ac_cv_have_ipv6" = yes; then
   if test "$ac_cv_multicast" = yes; then
-    AC_CHECK_TYPES(struct ipv6_mreq,,,[#include "compat/headers_slim.h"])
-    AC_CHECK_DECLS(IPV6_ADD_MEMBERSHIP,,,[#include "compat/headers_slim.h"])
-    AC_CHECK_DECLS(IPV6_MULTICAST_HOPS,,,[#include "compat/headers_slim.h"])
+    AC_CHECK_TYPES(struct ipv6_mreq,,,[#include "${srcdir}/compat/headers_slim.h"])
+    AC_CHECK_DECLS(IPV6_ADD_MEMBERSHIP,,,[#include "${srcdir}/compat/headers_slim.h"])
+    AC_CHECK_DECLS(IPV6_MULTICAST_HOPS,,,[#include "${srcdir}/compat/headers_slim.h"])
     AC_MSG_CHECKING(for IPv6 multicast support)
     ac_cv_have_ipv6_multicast=no
     if test "$ac_cv_type_struct_ipv6_mreq" = yes; then