diff --git a/gambas3-3.14.3-printf.patch b/gambas3-3.14.3-printf.patch
new file mode 100644
index 0000000..892ae35
--- /dev/null
+++ b/gambas3-3.14.3-printf.patch
@@ -0,0 +1,46 @@
+diff -up gambas-3.14.3/gb.db.postgresql/src/main.c.orig gambas-3.14.3/gb.db.postgresql/src/main.c
+--- gambas-3.14.3/gb.db.postgresql/src/main.c.orig	2020-06-22 21:31:16.035953348 +0200
++++ gambas-3.14.3/gb.db.postgresql/src/main.c	2020-06-22 21:33:38.812290889 +0200
+@@ -33,6 +33,42 @@
+ #include <postgres.h>
+ #include <pg_type.h>
+ 
++// Starting v12, PostgreSQL (libpq) redefins printf symbol but the
++// implementation is not exported.
++// This should work-around the issue before a more robust solution is found.
++// PostgreSQL commit that caused this:
++// https://github.com/postgres/postgres/commit/96bf88d5271
++#ifdef vsnprintf
++#undef vsnprintf
++#endif
++#ifdef snprintf
++#undef snprintf
++#endif
++#ifdef vsprintf
++#undef vsprintf
++#endif
++#ifdef sprintf
++#undef sprintf
++#endif
++#ifdef vfprintf
++#undef vfprintf
++#endif
++#ifdef fprintf
++#undef fprintf
++#endif
++#ifdef vprintf
++#undef vprintf
++#endif
++#ifdef printf
++#undef printf
++#endif
++#ifdef strerror
++#undef strerror
++#endif
++#ifdef strerror_r
++#undef strerror_r
++#endif
++
+ #ifdef PACKAGE_NAME
+ 	#undef PACKAGE_NAME
+ 	#undef PACKAGE_BUGREPORT
diff --git a/gambas3.spec b/gambas3.spec
index 744aa1e..1ce6e27 100644
--- a/gambas3.spec
+++ b/gambas3.spec
@@ -40,6 +40,7 @@ Patch1:		%{name}-3.12.2-nolintl.patch
 Patch2:		%{name}-3.12.2-noliconv.patch
 Patch4:		%{name}-3.13.0-poppler-0.73.0.patch
 Patch5:		%{name}-3.14.1-gst1.patch
+Patch6:		%{name}-3.14.3-printf.patch
 
 %description
 Gambas3 is a free development environment based on a Basic interpreter
@@ -872,6 +873,7 @@ Requires:	%{name}-gb-xml = %{version}-%{release}
 %patch2 -p1 -b .noliconv
 %patch4 -p1 -b .poppler_0.73.0
 %patch5 -p1 -b .gst1
+%patch6 -p1 -b .printf
 for i in `find . |grep acinclude.m4`; do
 	sed -i 's|$AM_CFLAGS -O3|$AM_CFLAGS|g' $i
 	sed -i 's|$AM_CXXFLAGS -Os -fno-omit-frame-pointer|$AM_CXXFLAGS|g' $i