Hi, My distro, Arch Linux, has gmime-2.6.4 in their testing repo. Notmuch (from git master branch) fails to build with the following output: CC -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 command-line-arguments.o CC -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 debugger.o In file included from debugger.c:21:0: notmuch-client.h:72:5: error: unknown type name ‘GMimeSignatureValidity’ notmuch-client.h:86:5: error: unknown type name ‘GMimeCipherContext’ notmuch-client.h:297:5: error: unknown type name ‘GMimeSignatureValidity’ notmuch-client.h:322:3: error: unknown type name ‘GMimeCipherContext’ make: *** [debugger.o] Error 1 Not sure if you're aware of this? Kind Regards, Mark