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musl 1.1.19 introduced the _DIRENT_HAVE_D_* macros in commit
1bc10ffeaa7c7ce44b3e214e02e302642511c7c7, triggering a bug in GNU make
that's present up to the current version:
http://git.savannah.gnu.org/cgit/make.git/tree/glob/glob.c?id=5d653b535a0e0e607c8be2016bcaadd6f326a698#n1333
The glob replacement they ship includes and uses internally a
GLOB_ONLYDIR flag, which is opportunistic and implemented via d_type
if _DIRENT_HAVE_D_TYPE is defined, and it fails to consider that
DT_LNK could be a symlink to a directory. This is an ancient version
of glob.c; the modern GNU glob in glibc rightly considers DT_LNK. Thus
the bug is not seen on glibc systems (where the glob replacement is
not used), but will be seen on any system where _DIRENT_HAVE_D_TYPE is
defined and where configure decides to replace the libc glob with
their GNU one.
http://www.openwall.com/lists/musl/2018/03/13/1
diff --git a/glob/glob.c b/glob/glob.c
index f3911bc..d6bb8ba 100644
--- a/glob/glob.c
+++ b/glob/glob.c
@@ -1330,7 +1330,7 @@ glob_in_dir (pattern, directory, flags, errfunc, pglob)
/* If we shall match only directories use the information
provided by the dirent call if possible. */
if ((flags & GLOB_ONLYDIR)
- && d->d_type != DT_UNKNOWN && d->d_type != DT_DIR)
+ && d->d_type != DT_UNKNOWN && d->d_type != DT_DIR && d->d_type != DT_LNK)
continue;
#endif
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