Any chance of fixing this?

In apps/http/altcp_proxyconnect.c, defining both of the above definitions makes altcp_proxyconnect_functions initialization list out of sync with its type altcp_functions.

Compilation failed because it was trying to initialize altcp_keepalive_disable_fn with altcp_default_dbg_get_tcp_state.

Not defining LWIP_DEBUG compiles but initializes altcp_keepalive_disable_fn and altcp_keepalive_enable_fn as nulls. I wonder if that's ok.

% git describe
STABLE-2_1_0_RELEASE-542-g215dec65

% git grep 'set(LWIP_VERSION_' src/Filelists.cmake                                                                                                                  
src/Filelists.cmake:set(LWIP_VERSION_MAJOR    "2")
src/Filelists.cmake:set(LWIP_VERSION_MINOR    "2")
src/Filelists.cmake:set(LWIP_VERSION_REVISION "0")
src/Filelists.cmake:set(LWIP_VERSION_RC       "LWIP_RC_DEVELOPMENT")