diff --git a/package/libdbi-drivers/0001-libdbi-drivers-c99.patch b/package/libdbi-drivers/0001-libdbi-drivers-c99.patch
new file mode 100644
index 0000000000..46b43c8653
--- /dev/null
+++ b/package/libdbi-drivers/0001-libdbi-drivers-c99.patch
@@ -0,0 +1,45 @@
+Fix type errors in the cgreen with constraints facility.
+
+Upstream: https://sourceforge.net/p/libdbi-drivers/bugs/28/
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+[Bernd: rebased for git tree used by buildroot]
+
+diff --git a/tests/cgreen/src/constraint.c b/tests/cgreen/src/constraint.c
+index c19c0ddd41a7bfa7..95673dd3e222a3cf 100644
+--- a/tests/cgreen/src/constraint.c
++++ b/tests/cgreen/src/constraint.c
+@@ -22,8 +22,7 @@ static double unbox_double(intptr_t box);
+ static double as_double(intptr_t box);
+ 
+ static int compare_using_matcher(Constraint *constraint, intptr_t actual);
+-static void test_with_matcher(Constraint *constraint, const char *function, const char* matcher_name, intptr_t actual, const char *test_file, int test_line, TestReporter *reporter);
+-
++static void test_with_matcher(Constraint *constraint, const char *function, intptr_t matcher_function, const char *test_file, int test_line, TestReporter *reporter);
+ 
+ void destroy_constraint(void *abstract) {
+     Constraint *constraint = (Constraint *)abstract;
+@@ -164,11 +163,11 @@
+ }
+ 
+ static int compare_using_matcher(Constraint *constraint, intptr_t actual) {
+-	int (*matches)(const void*) = (void *)(intptr_t)constraint->expected;
+-    return matches((void *)actual);
++	int (*matches)(const void*) = (int (*)(const void*)) constraint->expected;
++    return matches((const void *)actual);
+ }
+ 
+-static void test_with_matcher(Constraint *constraint, const char *function, const char* matcher_name, intptr_t matcher_function, const char *test_file, int test_line, TestReporter *reporter) {
++static void test_with_matcher(Constraint *constraint, const char *function, intptr_t matcher_function, const char *test_file, int test_line, TestReporter *reporter) {
+     (*reporter->assert_true)(
+             reporter,
+             test_file,
+@@ -176,7 +175,7 @@ static void test_with_matcher(Constraint *constraint, const char *function, cons
+             (*constraint->compare)(constraint, matcher_function),
+             "Wanted parameter [%s] to match [%s] in function [%s]",
+             constraint->parameter,
+-            matcher_name,
++            constraint->name,
+             function);
+ }
+