Explicitly link poppler-glib against pthread
Debian complains about missing symbols:
dpkg-shlibdeps: warning: symbol pthread_mutexattr_destroy used by debian/libpoppler-glib8/usr/lib/i386-linux-gnu/libpoppler-glib.so.8.6.0 found in none of the libraries
dpkg-shlibdeps: warning: symbol pthread_mutexattr_init used by debian/libpoppler-glib8/usr/lib/i386-linux-gnu/libpoppler-glib.so.8.6.0 found in none of the libraries
dpkg-shlibdeps: warning: symbol pthread_mutexattr_settype used by debian/libpoppler-glib8/usr/lib/i386-linux-gnu/libpoppler-glib.so.8.6.0 found in none of the libraries
https://bugs.freedesktop.org/show_bug.cgi?id=91450
diff --git a/glib/Makefile.am b/glib/Makefile.am
index eb00442..52669e2 100644
--- a/glib/Makefile.am
+++ b/glib/Makefile.am
@@ -77,6 +77,7 @@
libpoppler_glib_la_LIBADD = \
$(top_builddir)/poppler/libpoppler.la \
$(top_builddir)/poppler/libpoppler-cairo.la \
+ $(PTHREAD_LIBS) \
$(POPPLER_GLIB_LIBS) \
$(FREETYPE_LIBS)
