commit a26a929b193e4bcbbf58e6053bfd71e64c643763
Author: Renzo Davoli <renzo@cs.unibo.it>
Date:   Tue Jan 17 17:35:32 2023 +0100

    contrib/port/unix/lib: exclude slipif.c source

diff --git a/contrib/ports/unix/lib/CMakeLists.txt b/contrib/ports/unix/lib/CMakeLists.txt
index 93d17bd0..40229c44 100644
--- a/contrib/ports/unix/lib/CMakeLists.txt
+++ b/contrib/ports/unix/lib/CMakeLists.txt
@@ -19,6 +19,7 @@ set (LWIP_INCLUDE_DIRS
     "${CMAKE_CURRENT_SOURCE_DIR}/"
 )
 
+set (LWIP_EXCLUDE_SLIPIF TRUE)
 include(${LWIP_CONTRIB_DIR}/ports/unix/Filelists.cmake)
 include(${LWIP_DIR}/src/Filelists.cmake)
 
diff --git a/src/Filelists.cmake b/src/Filelists.cmake
index 6003c6fc..29168441 100644
--- a/src/Filelists.cmake
+++ b/src/Filelists.cmake
@@ -98,9 +98,13 @@ set(lwipnetif_SRCS
     ${LWIP_DIR}/src/netif/ethernet.c
     ${LWIP_DIR}/src/netif/bridgeif.c
     ${LWIP_DIR}/src/netif/bridgeif_fdb.c
-    ${LWIP_DIR}/src/netif/slipif.c
 )
 
+if (${LWIP_EXCLUDE_SLIPIF})
+else()
+	list(APPEND lwipnetif_SRCS ${LWIP_DIR}/src/netif/slipif.c)
+endif()
+
 # 6LoWPAN
 set(lwipsixlowpan_SRCS
     ${LWIP_DIR}/src/netif/lowpan6_common.c