owner@ubuntu1604-x64-vm:~/curl$ grep -r --files-without-match --include='*.c' -F '#include "memdebug.h"' lib src | sort
lib/curl_ctype.c
lib/curl_des.c
lib/curl_endian.c
lib/curl_gethostname.c
lib/curl_multibyte.c
lib/curl_range.c
lib/easygetopt.c
lib/easyoptions.c
lib/inet_ntop.c
lib/inet_pton.c
lib/nonblock.c
lib/nwos.c
lib/parsedate.c
lib/progress.c
lib/select.c
lib/speedcheck.c
lib/splay.c
lib/strcase.c
lib/strtok.c
lib/strtoofft.c
lib/timeval.c
lib/version.c
lib/vquic/vquic.c
lib/vtls/bearssl.c
lib/vtls/rustls.c
lib/warnless.c
src/tool_filetime.c
src/tool_progress.c
src/tool_strdup.c
src/tool_writeout_json.c