make build EXTRACFLAGS='-Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -fPIC -fpermissive' EXTRALDFLAGS='-Wl,--as-needed,-O1,--sort-common -Wl,-z,pack-relative-relocs' EXTRADRIVERS='mbox' EXTRAAUTHENTICATORS='' PASSWDTYPE=std SSLTYPE=unix IP=4 EXTRASPECIALS='' BUILDTYPE=slx cd c-client;make slx EXTRACFLAGS='-Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -fPIC -fpermissive'\ make build EXTRACFLAGS='-Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -fPIC -fpermissive' EXTRALDFLAGS='-Wl,--as-needed,-O1,--sort-common -Wl,-z,pack-relative-relocs' EXTRADRIVERS='mbox' EXTRAAUTHENTICATORS='' PASSWDTYPE=std SSLTYPE=unix IP=4 `cat SPECIALS` OS=slx \ echo `cat CFLAGS` -g -O2 -pipe -fno-omit-frame-pointer '-Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -fPIC -fpermissive' -DCHUNKSIZE=65536 > CFLAGS If you get No such file error messages for files x509.h, ssl.h, osdep.c:231:10: fatal error: x509v3.h: No such file or directory make[3]: *** [Makefile:926: osdep.o] Error 1 make[2]: *** [Makefile:677: slx] Error 2 make[1]: *** [Makefile:688: OSTYPE] Error 2 make: *** [Makefile:311: slx] Error 2 >>> ERROR: imap: build failed