diff --git a/autofiles.sums b/autofiles.sums
index d80a2bc7..89be5836 100644
--- a/autofiles.sums
+++ b/autofiles.sums
@@ -1,6 +1,6 @@
-be950d7be6b0aa2c9c926ac43ca9478ef864b1cb2c8184fd393c9ce4c0972bcc  configure.ac
+055e54a34d94a0c2ed9451042a1c747e47b29259a9035af9e7327401a5c3fbd1  configure.ac
 d3f9ee6f6f0846888d9a10fd3dad2e4b1258be84205426cf04d7cef02d61dad7  aclocal.m4
-b0ce6d1dba8effa47d25154b2bb56eddafc997254a0f3f903cf9b6abffc03616  libqpdf/qpdf/qpdf-config.h.in
+cf2c764639c4c94abc183a0976eca6ae500b80790ea25e3d0af97b23587363b7  libqpdf/qpdf/qpdf-config.h.in
 5297971a0ef90bcd5563eb3f7127a032bb76d3ae2af7258bf13479caf8983a60  m4/ax_cxx_compile_stdcxx.m4
 35bc5c645dc42d47f2daeea06f8f3e767c8a1aee6a35eb2b4854fd2ce66c3413  m4/ax_random_device.m4
 6a1e4f8aa2902d7993300660c43e6ee479b4b6781ed7d5ef9c9f9f1cc46623b7  m4/libtool.m4
diff --git a/configure b/configure
index d6aebce8..47e08dad 100755
--- a/configure
+++ b/configure
@@ -17694,6 +17694,63 @@ $as_echo "no" >&6; }
    fi
 fi
 
+LL_FMT=""
+oCFLAGS=$CFLAGS
+CFLAGS="$WFLAGS $CFLAGS"
+for fmt in "%lld" "%I64d" "%I64lld"; do
+  if test "$LL_FMT" = ""; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking printf format for long long: $fmt" >&5
+$as_echo_n "checking printf format for long long: $fmt... " >&6; }
+    if test "$cross_compiling" = yes; then :
+  LL_FMT="%lld"
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+        #define _CRT_SECURE_NO_WARNINGS
+        #include <stdio.h>
+        #include <string.h>
+
+int
+main ()
+{
+
+        long long int a = 123456789012345ll;
+        char s[30];
+        sprintf(s, "$fmt", a);
+        return (strcmp(s, "123456789012345") == 0) ? 0 : 1
+
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  LL_FMT=$fmt
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+    if test "$LL_FMT" != ""; then
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+    else
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  fi
+done
+CFLAGS=$oCFLAGS
+if test "LL_FMT" = ""; then
+  LL_FMT="%lld%"
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define LL_FMT "$LL_FMT"
+_ACEOF
+
+
 
 
 if test "$BUILDRULES" = "msvc"; then
diff --git a/configure.ac b/configure.ac
index 3e91ae19..83587b82 100644
--- a/configure.ac
+++ b/configure.ac
@@ -505,6 +505,39 @@ if test "$BUILDRULES" != "msvc"; then
    fi
 fi
 
+LL_FMT=""
+oCFLAGS=$CFLAGS
+CFLAGS="$WFLAGS $CFLAGS"
+for fmt in "%lld" "%I64d" "%I64lld"; do
+  if test "$LL_FMT" = ""; then
+    AC_MSG_CHECKING(printf format for long long: $fmt)
+    AC_RUN_IFELSE([AC_LANG_PROGRAM(
+     [[
+        #define _CRT_SECURE_NO_WARNINGS
+        #include <stdio.h>
+        #include <string.h>
+     ]],
+     [[
+        long long int a = 123456789012345ll;
+        char s[30];
+        sprintf(s, "]$fmt[", a);
+        return (strcmp(s, "123456789012345") == 0) ? 0 : 1
+     ]]
+     )],
+     [LL_FMT=$fmt],[],[LL_FMT="%lld"])
+    if test "$LL_FMT" != ""; then
+       AC_MSG_RESULT(yes)
+    else
+       AC_MSG_RESULT(no)
+    fi
+  fi
+done
+CFLAGS=$oCFLAGS
+if test "LL_FMT" = ""; then
+  LL_FMT="%lld%"
+fi
+AC_DEFINE_UNQUOTED([LL_FMT], ["$LL_FMT"], [printf format for long long])
+
 AC_SUBST(WINDOWS_WMAIN_XLINK_FLAGS)
 AC_SUBST(WINDOWS_MAIN_XLINK_FLAGS)
 if test "$BUILDRULES" = "msvc"; then
diff --git a/libqpdf/qpdf/qpdf-config.h.in b/libqpdf/qpdf/qpdf-config.h.in
index c9886b57..2a279d6a 100644
--- a/libqpdf/qpdf/qpdf-config.h.in
+++ b/libqpdf/qpdf/qpdf-config.h.in
@@ -51,6 +51,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* printf format for long long */
+#undef LL_FMT
+
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #undef LT_OBJDIR
 
diff --git a/make/libtool.mk b/make/libtool.mk
index abd0aa7e..1ab92b75 100644
--- a/make/libtool.mk
+++ b/make/libtool.mk
@@ -47,10 +47,10 @@ define compile
 		-c $(1) -o $(call src_to_obj,$(1))
 endef
 
-#                       1   2
-# Usage: $(call c_compile,src,includes)
+#                         1   2        3
+# Usage: $(call c_compile,src,includes,xflags)
 define c_compile
-	$(CC) $(CFLAGS) \
+	$(CC) $(CFLAGS) $(3) \
 		$(call depflags,$(basename $(call c_src_to_obj,$(1)))) \
 		$(foreach I,$(2),-I$(I)) \
 		$(CPPFLAGS) \
diff --git a/make/mingw.mk b/make/mingw.mk
index 9689ef94..20d648b0 100644
--- a/make/mingw.mk
+++ b/make/mingw.mk
@@ -24,10 +24,10 @@ define compile
 		-c $(1) -o $(call src_to_obj,$(1))
 endef
 
-#                       1   2
-# Usage: $(call c_compile,src,includes)
+#                         1   2        3
+# Usage: $(call c_compile,src,includes,xflags)
 define c_compile
-	$(CC) $(CPPFLAGS) $(CFLAGS) \
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(3) \
 		$(call depflags,$(basename $(call src_to_obj,$(1)))) \
 		$(foreach I,$(2),-I$(I)) \
 		-c $(1) -o $(call c_src_to_obj,$(1))
diff --git a/make/msvc.mk b/make/msvc.mk
index 108ce3b6..c8bc57bc 100644
--- a/make/msvc.mk
+++ b/make/msvc.mk
@@ -32,10 +32,10 @@ define compile
 		-c $(1) -Fo$(call src_to_obj,$(1))
 endef
 
-#                       1   2
-# Usage: $(call c_compile,src,includes)
+#                         1   2        3
+# Usage: $(call c_compile,src,includes,xflags)
 define c_compile
-	cl -nologo -O2 -Zi -Gy -EHsc -MD $(CPPFLAGS) $(CFLAGS) \
+	cl -nologo -O2 -Zi -Gy -EHsc -MD $(CPPFLAGS) $(CFLAGS) $(3) \
 		$(foreach I,$(2),-I$(I)) \
 		-c $(1) -Fo$(call c_src_to_obj,$(1))
 endef
diff --git a/qpdf/build.mk b/qpdf/build.mk
index a9dd7187..1bab58b7 100644
--- a/qpdf/build.mk
+++ b/qpdf/build.mk
@@ -48,7 +48,7 @@ $(foreach B,$(BINS_qpdf),$(eval \
 
 $(foreach B,$(CBINS_qpdf),$(eval \
   $(OBJS_$(B)): qpdf/$(OUTPUT_DIR)/%.$(OBJ): qpdf/$(B).c ; \
-	$(call c_compile,qpdf/$(B).c,$(INCLUDES_qpdf))))
+	$(call c_compile,qpdf/$(B).c,$(INCLUDES_qpdf),$(XCFLAGS_qpdf_$(B)))))
 
 $(foreach B,$(BINS_qpdf) $(CBINS_qpdf),$(eval \
   qpdf/$(OUTPUT_DIR)/$(call binname,$(B)): $(OBJS_$(B)) ; \
diff --git a/qpdf/qpdf-ctest.c b/qpdf/qpdf-ctest.c
index 579d5890..fad121af 100644
--- a/qpdf/qpdf-ctest.c
+++ b/qpdf/qpdf-ctest.c
@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include "../libqpdf/qpdf/qpdf-config.h" // for LL_FMT
 
 static char* whoami = 0;
 static qpdf_data qpdf = 0;
@@ -36,13 +37,7 @@ static FILE* safe_fopen(char const* filename, char const* mode)
 
 static void report_errors()
 {
-#ifdef _WIN32
-# define POS_FMT "  pos : %I64d\n"
-#else
-/* If your compiler doesn't support lld, change to ld and lose
-   precision on offsets in error messages. */
-# define POS_FMT "  pos : %lld\n"
-#endif
+#define POS_FMT "  pos : " LL_FMT "\n"
     qpdf_error e = 0;
     while (qpdf_more_warnings(qpdf))
     {