--- a/backend/Makefile.in	2020-05-17 06:54:47.000000000 -0500
+++ b/backend/Makefile.in	2020-06-17 13:04:12.448999036 -0500
@@ -4118,8 +4118,7 @@
 
 libdll_preload_la_SOURCES = dll.c
 libdll_preload_la_CPPFLAGS = $(AM_CPPFLAGS) -DBACKEND_NAME=dll -DENABLE_PRELOAD
-libdll_preload_la_LIBADD = ../sanei/sanei_usb.lo \
-     $(USB_LIBS) $(XML_LIBS)
+libdll_preload_la_LIBADD = $(USB_LIBS) $(XML_LIBS)
 
 libdll_la_SOURCES = dll.c
 libdll_la_CPPFLAGS = $(AM_CPPFLAGS) -DBACKEND_NAME=dll
 
--- a/frontend/jpegtopdf.c	2022-01-19 10:38:00.000000000 -0600
+++ b/frontend/jpegtopdf.c	2023-01-25 20:25:34.785193718 -0600
@@ -29,6 +29,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#define _POSIX_THREAD_SAFE_FUNCTIONS
 #include <time.h>
 #include "jpegtopdf.h"