Instructions to compile the source on Freebsd: in config.mk, change the line : CFLAGS += -std=c99 -Os ${INCS} -DVERSION=\"${VERSION}\" -DNDEBUG -D_POSIX_C_SOU

Instructions to compile the source on Freebsd: in config.mk, change the line : CFLAGS += -std=c99 -Os ${INCS} -DVERSION=\"${VERSION}\" -DNDEBUG -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 to: CFLAGS += -std=c99 -Os ${INCS} -DVERSION=\"${VERSION}\" -DNDEBUG The flags (the removed ones), trigger the "__BSD_VISIBLE 0" macro that makes the signal "SIGWINCH" unavailable, as they are used in vis.c