on Alpine Linux I got this error:

/usr/bin/Thunar: symbol 'apr_uuid_parse': can't resolve symbol

(thunar:2582): thunarx-WARNING **: Failed to load plugin `thunar-vcs-plugin.so': unknown dl-error


nm -D | grep apr shows that plugin uses apr symbols:
                 U apr_ctime
                 U apr_initialize
                 U apr_pool_destroy
                 U apr_terminate

readelf -d shows that libapr is not linked:
 0x0000000000000001 (NEEDED)             Shared library: [libsvn_client-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libsvn_wc-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libsvn_fs-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libsvn_subr-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0.9.32]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.0.9.32]
 0x000000000000000e (SONAME)             Library soname: [thunar-vcs-plugin.so]

I suspect it works on glibc due to the indirect linking via the libsvn_* libs, but it does not work with uClibc.

looking at the Makefile.am shows that it actually tries to do the correct thing:
if HAVE_SUBVERSION
thunar_vcs_plugin_la_LDFLAGS +=                                         \
        $(APR_LDFLAGS)
endif


However APR_LDFLAS is wrong. It appears that the macros uses APR_LIBS. Replacing APR_LDFLAGS with APR_LIBS solves it.