g-ir-scanner: link: /bin/sh ../libtool --mode=link --tag=CC clang -o /home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/libxfce4util-1.0 -export-dynamic -DHAVE_GNUC_VISIBILITY -g -O2 -DXFCE_DISABLE_DEPRECATED -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Wmissing-noreturn -Wpointer-arith -Wcast-align -Wformat -Wformat-security -Wformat-y2k -Winit-self -Wmissing-include-dirs -Wundef -Wnested-externs -g -Wshadow /home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/libxfce4util-1.0.o -L. libxfce4util.la -L/usr/local/lib -Wl,-E -pthread -lgio-2.0 -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 -lintl -Wl,-O1
libtool: link: clang -o /home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/.libs/libxfce4util-1.0 -DHAVE_GNUC_VISIBILITY -g -O2 -DXFCE_DISABLE_DEPRECATED -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Wmissing-noreturn -Wpointer-arith -Wcast-align -Wformat -Wformat-security -Wformat-y2k -Winit-self -Wmissing-include-dirs -Wundef -Wnested-externs -g -Wshadow /home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/libxfce4util-1.0.o -Wl,-E -pthread -Wl,-O1 -Wl,-E  -L. -L./.libs -lxfce4util -L/usr/local/lib -lgio-2.0 -lz -lgobject-2.0 -lffi -lgmodule-2.0 -lglib-2.0 -lpcre -lintl -liconv -lc -pthread -Wl,-rpath,/usr/local/lib
/usr/local/lib/libgobject-2.0.so.4200.7: warning: strcat() is almost always misused, please use strlcat()
/usr/local/lib/libglib-2.0.so.4201.0: warning: vsprintf() is often misused, please use vsnprintf()
/usr/local/lib/libgio-2.0.so.4200.7: warning: strcpy() is almost always misused, please use strlcpy()
/usr/local/lib/libglib-2.0.so.4201.0: warning: stpcpy() is dangerous; do not use it
/usr/local/lib/libglib-2.0.so.4201.0: warning: sprintf() is often misused, please use snprintf()
ld.so: libxfce4util-1.0: can't load library 'libxfce4util.so.7.0'
/home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/.libs/libxfce4util-1.0: signal 9
Traceback (most recent call last):
  File "/usr/local/bin/g-ir-scanner", line 66, in <module>
    sys.exit(scanner_main(sys.argv))
  File "/usr/local/lib/gobject-introspection/giscanner/scannermain.py", line 547, in scanner_main
    shlibs = create_binary(transformer, options, args)
  File "/usr/local/lib/gobject-introspection/giscanner/scannermain.py", line 424, in create_binary
    shlibs = resolve_shlibs(options, binary, options.libraries)
  File "/usr/local/lib/gobject-introspection/giscanner/shlibs.py", line 158, in resolve_shlibs
    _resolve_non_libtool(options, binary, non_libtool))
  File "/usr/local/lib/gobject-introspection/giscanner/shlibs.py", line 109, in _resolve_non_libtool
    output = subprocess.check_output(args, universal_newlines=True, errors='replace')
  File "/usr/local/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "/usr/local/lib/python3.6/subprocess.py", line 418, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/bin/sh', '../libtool', '--mode=execute', 'ldd', '/home/vagrant/libxfce4util/libxfce4util/tmp-introspecte14nu9sv/.libs/libxfce4util-1.0']' returned non-zero exit status 1.