Heute erhielt ich folgende Fehlermeldung:

--->  Computing dependencies for curlftpfs
--->  Dependencies to be installed: osxfuse
--->  Building osxfuse
Error: Failed to build osxfuse: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_fuse_osxfuse/osxfuse/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port curlftpfs failed

In der angegebenen main.log las ich:

...
:info:build Command /bin/sh failed with exit code 1
:info:build ** BUILD FAILED **
:info:build The following build commands failed:
:info:build 	PhaseScriptExecution BridgeSupport\ Metadata build/OSXFUSE.build/Release/OSXFUSE.build/Script-28D525C40EA8076400B7CF7B.sh
:info:build (1 failure)
:info:build T:framework          | Failed to build target
:info:build Terminated: 15
:info:build Received signal: SIGTERM
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_fuse_osxfuse/osxfuse/work/osxfuse-osxfuse-431bdc5" && ./build.sh -t packagemanager -a build -v 5 --build-directory="/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_fuse_osxfuse/osxfuse/work" -- -a x86_64 --framework-prefix="/opt/local" --fsbundle-prefix="/opt/local" --library-prefix="/opt/local" 
:info:build Killed by signal: 15
:error:build Failed to build osxfuse: command execution failed
:debug:build Error code: CHILDKILLED 1299 SIGTERM {software termination signal}
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"
:debug:build invalid command name "::ui_init"
:debug:build     while executing
:debug:build "::ui_init $priority $prefix $channels($priority) {*}$args"
:debug:build     ("uplevel" body line 2)
:debug:build     invoked from within
:debug:build "uplevel 1 $body"
:error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_fuse_osxfuse/osxfuse/main.log for details.

Da ich keine Lösung für das Problem fand, eröffnete ich im MacPorts Trac einen Defect: osxfuse: build failed with SIGTERM

Die Antwort kam postwended — das Problem sei bekannt und bereits im Defect osxfuse @3.7.1: Library not loaded: @rpath/libclang.dylib (LoadError) beschrieben.

Als temporärer Workaround wird dort empfohlen:

$ cd /Applications/Xcode.app/Contents/Developer/Toolchains
$ sudo ln -s XcodeDefault.xctoolchain OSX10.13.xctoolchain

Danach kompilierte die Sache problemlos.