diff --git a/libdmtx-0.7.5-c99.patch b/libdmtx-0.7.5-c99.patch
new file mode 100644
index 0000000..1ccf17f
--- /dev/null
+++ b/libdmtx-0.7.5-c99.patch
@@ -0,0 +1,36 @@
+diff -up libdmtx-0.7.5/test/multi_test/Makefile.am.std libdmtx-0.7.5/test/multi_test/Makefile.am
+--- libdmtx-0.7.5/test/multi_test/Makefile.am.std	2018-04-06 13:14:23.000000000 +0200
++++ libdmtx-0.7.5/test/multi_test/Makefile.am	2018-04-06 13:14:27.000000000 +0200
+@@ -1,4 +1,4 @@
+-AM_CPPFLAGS = -Wshadow -Wall -pedantic -ansi
++AM_CPPFLAGS = -Wshadow -Wall -pedantic -std=c99
+ 
+ check_PROGRAMS = multi_test
+ 
+diff -up libdmtx-0.7.5/test/rotate_test/Makefile.am.std libdmtx-0.7.5/test/rotate_test/Makefile.am
+--- libdmtx-0.7.5/test/rotate_test/Makefile.am.std	2018-04-06 13:14:13.000000000 +0200
++++ libdmtx-0.7.5/test/rotate_test/Makefile.am	2018-04-06 13:14:18.000000000 +0200
+@@ -1,4 +1,4 @@
+-AM_CPPFLAGS = -Wshadow -Wall -pedantic -ansi
++AM_CPPFLAGS = -Wshadow -Wall -pedantic -std=c99
+ 
+ check_PROGRAMS = rotate_test
+ 
+diff -up libdmtx-0.7.5/test/simple_test/Makefile.am.std libdmtx-0.7.5/test/simple_test/Makefile.am
+--- libdmtx-0.7.5/test/simple_test/Makefile.am.std	2018-04-06 13:13:59.000000000 +0200
++++ libdmtx-0.7.5/test/simple_test/Makefile.am	2018-04-06 13:14:04.000000000 +0200
+@@ -1,4 +1,4 @@
+-AM_CPPFLAGS = -Wshadow -Wall -pedantic -ansi
++AM_CPPFLAGS = -Wshadow -Wall -pedantic -std=c99
+ 
+ check_PROGRAMS = simple_test
+ 
+diff -up libdmtx-0.7.5/test/unit_test/Makefile.am.std libdmtx-0.7.5/test/unit_test/Makefile.am
+--- libdmtx-0.7.5/test/unit_test/Makefile.am.std	2018-04-06 13:13:41.000000000 +0200
++++ libdmtx-0.7.5/test/unit_test/Makefile.am	2018-04-06 13:13:53.000000000 +0200
+@@ -1,4 +1,4 @@
+-AM_CPPFLAGS = -Wshadow -Wall -pedantic -ansi
++AM_CPPFLAGS = -Wshadow -Wall -pedantic -std=c99
+ 
+ check_PROGRAMS = unit_test
+ 
diff --git a/libdmtx-0.7.5-math.patch b/libdmtx-0.7.5-math.patch
new file mode 100644
index 0000000..41c7557
--- /dev/null
+++ b/libdmtx-0.7.5-math.patch
@@ -0,0 +1,11 @@
+diff -up libdmtx-0.7.5/test/simple_test/simple_test.c.math libdmtx-0.7.5/test/simple_test/simple_test.c
+--- libdmtx-0.7.5/test/simple_test/simple_test.c.math	2018-04-06 13:19:44.000000000 +0200
++++ libdmtx-0.7.5/test/simple_test/simple_test.c	2018-04-06 13:19:52.000000000 +0200
+@@ -18,6 +18,7 @@
+ #include <stdio.h>
+ #include <string.h>
+ #include <assert.h>
++#include <math.h>
+ #include <dmtx.h>
+ 
+ int
diff --git a/libdmtx-0.7.5-size_t.patch b/libdmtx-0.7.5-size_t.patch
new file mode 100644
index 0000000..6dc5fce
--- /dev/null
+++ b/libdmtx-0.7.5-size_t.patch
@@ -0,0 +1,29 @@
+diff -up libdmtx-0.7.5/test/simple_test/simple_test.c.size_t libdmtx-0.7.5/test/simple_test/simple_test.c
+--- libdmtx-0.7.5/test/simple_test/simple_test.c.size_t	2018-04-06 13:16:35.000000000 +0200
++++ libdmtx-0.7.5/test/simple_test/simple_test.c	2018-04-06 13:17:14.000000000 +0200
+@@ -58,9 +58,9 @@ main(int argc, char *argv[])
+ 
+    dmtxEncodeDestroy(&enc);
+ 
+-   fprintf(stdout, "width:  \"%d\"\n", width);
+-   fprintf(stdout, "height: \"%d\"\n", height);
+-   fprintf(stdout, "bpp:    \"%d\"\n", bytesPerPixel);
++   fprintf(stdout, "width:  \"%zd\"\n", width);
++   fprintf(stdout, "height: \"%zd\"\n", height);
++   fprintf(stdout, "bpp:    \"%zd\"\n", bytesPerPixel);
+ 
+    for (int i=0; i<width*height; i++){
+       fprintf(stdout, "%d", (pxl[i*3])==0);
+@@ -81,9 +81,9 @@ main(int argc, char *argv[])
+    if(reg != NULL) {
+       msg = dmtxDecodeMatrixRegion(dec, reg, DmtxUndefined);
+ 
+-      fprintf(stdout, "msg->arraySize :  \"%d\"\n", msg->arraySize );
+-      fprintf(stdout, "msg->codeSize  :  \"%d\"\n", msg->codeSize  );
+-      fprintf(stdout, "msg->outputSize:  \"%d\"\n", msg->outputSize);
++      fprintf(stdout, "msg->arraySize :  \"%zd\"\n", msg->arraySize );
++      fprintf(stdout, "msg->codeSize  :  \"%zd\"\n", msg->codeSize  );
++      fprintf(stdout, "msg->outputSize:  \"%zd\"\n", msg->outputSize);
+       int oned = sqrt(msg->arraySize);
+       for (int i=0; i<msg->arraySize; i++){
+          fprintf(stdout, " %c.", msg->array[i]);