diff --git a/rdkit-2018.03-pg11-booleans.patch b/rdkit-2018.03-pg11-booleans.patch
new file mode 100644
index 0000000..c79fee1
--- /dev/null
+++ b/rdkit-2018.03-pg11-booleans.patch
@@ -0,0 +1,111 @@
+diff -up rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gin.c.pg11 rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gin.c
+--- rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gin.c.pg11	2018-08-14 07:53:15.000000000 +0200
++++ rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gin.c	2018-10-22 10:01:21.282688340 +0200
+@@ -116,7 +116,7 @@ Datum gin_bfp_consistent(PG_FUNCTION_ARG
+ 
+   int32 i, nCommon = 0;
+   for (i = 0; i < nkeys; ++i) {
+-    if (check[i] == TRUE) {
++    if (check[i] == true) {
+       ++nCommon;
+     }
+   }
+diff -up rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gist.c.pg11 rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gist.c
+--- rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gist.c.pg11	2018-08-14 07:53:15.000000000 +0200
++++ rdkit-Release_2018_03_4/Code/PgSQL/rdkit/bfp_gist.c	2018-10-22 10:01:21.283688322 +0200
+@@ -137,7 +137,7 @@ gbfp_compress(PG_FUNCTION_ARGS)
+     
+     gistentryinit(*retval, PointerGetDatum(gbfp),
+ 		  entry->rel, entry->page,
+-		  entry->offset, FALSE);
++		  entry->offset, false);
+   }
+   /* no change should be required on inner nodes */
+   else {
+@@ -166,7 +166,7 @@ gbfp_decompress(PG_FUNCTION_ARGS)
+     retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
+     gistentryinit(*retval, PointerGetDatum(key),
+ 		  entry->rel, entry->page,
+-		  entry->offset, FALSE);
++		  entry->offset, false);
+     PG_RETURN_POINTER(retval);
+   }
+ 
+@@ -680,7 +680,7 @@ gbfp_fetch(PG_FUNCTION_ARGS)
+   retval = palloc(sizeof(GISTENTRY));
+   
+   gistentryinit(*retval, PointerGetDatum(bfp),
+-		entry->rel, entry->page, entry->offset, FALSE);
++		entry->rel, entry->page, entry->offset, false);
+   
+   PG_RETURN_POINTER(retval);
+ }
+diff -up rdkit-Release_2018_03_4/Code/PgSQL/rdkit/low_gist.c.pg11 rdkit-Release_2018_03_4/Code/PgSQL/rdkit/low_gist.c
+--- rdkit-Release_2018_03_4/Code/PgSQL/rdkit/low_gist.c.pg11	2018-10-22 10:01:45.598267763 +0200
++++ rdkit-Release_2018_03_4/Code/PgSQL/rdkit/low_gist.c	2018-10-22 10:01:54.674110783 +0200
+@@ -55,7 +55,7 @@ gslfp_compress(PG_FUNCTION_ARGS)
+ 
+     gistentryinit(*retval, PointerGetDatum(makeLowSparseFingerPrint(fp, NUMRANGE)),
+                   entry->rel, entry->page,
+-                  entry->offset, FALSE);
++                  entry->offset, false);
+     freeCSfp(fp);
+   }       
+                 
+@@ -76,7 +76,7 @@ gslfp_decompress(PG_FUNCTION_ARGS)
+ 
+       gistentryinit(*retval, PointerGetDatum(key),
+                     entry->rel, entry->page,
+-                    entry->offset, FALSE);
++                    entry->offset, false);
+ 
+       PG_RETURN_POINTER(retval);
+     }
+diff -up rdkit-Release_2018_03_4/Code/PgSQL/rdkit/rdkit_gist.c.pg11 rdkit-Release_2018_03_4/Code/PgSQL/rdkit/rdkit_gist.c
+--- rdkit-Release_2018_03_4/Code/PgSQL/rdkit/rdkit_gist.c.pg11	2018-08-14 07:53:15.000000000 +0200
++++ rdkit-Release_2018_03_4/Code/PgSQL/rdkit/rdkit_gist.c	2018-10-22 10:01:21.284688305 +0200
+@@ -69,7 +69,7 @@ compressAllTrue(GISTENTRY *entry)
+   
+   gistentryinit(*retval, PointerGetDatum(b),
+ 		entry->rel, entry->page,
+-		entry->offset, FALSE);
++		entry->offset, false);
+   
+   return retval;
+ }
+@@ -89,7 +89,7 @@ gmol_compress(PG_FUNCTION_ARGS)
+ 
+     gistentryinit(*retval, PointerGetDatum(makeMolSignature(m)),
+                   entry->rel, entry->page,
+-                  entry->offset, FALSE);
++                  entry->offset, false);
+     freeCROMol(m);
+   }       
+   else if ( !ISALLTRUE(DatumGetPointer(entry->key)) ) {
+@@ -114,7 +114,7 @@ gsfp_compress(PG_FUNCTION_ARGS)
+ 
+     gistentryinit(*retval, PointerGetDatum(makeSfpSignature(fp, NUMBITS)),
+                   entry->rel, entry->page,
+-                  entry->offset, FALSE);
++                  entry->offset, false);
+     freeCSfp(fp);
+   }       
+   else if ( !ISALLTRUE(DatumGetPointer(entry->key)) ) {
+@@ -137,7 +137,7 @@ gmol_decompress(PG_FUNCTION_ARGS)
+ 
+     gistentryinit(*retval, PointerGetDatum(key),
+ 		  entry->rel, entry->page,
+-		  entry->offset, FALSE);
++		  entry->offset, false);
+     
+     PG_RETURN_POINTER(retval);
+   }
+@@ -738,7 +738,7 @@ greaction_compress(PG_FUNCTION_ARGS)
+     
+     gistentryinit(*retval, PointerGetDatum(makeReactionSign(rxn)),
+                   entry->rel, entry->page,
+-                  entry->offset, FALSE);
++                  entry->offset, false);
+     freeChemReaction(rxn);
+   }
+   else if ( !ISALLTRUE(DatumGetPointer(entry->key)) ) {
diff --git a/rdkit.spec b/rdkit.spec
index 47f8a36..bbeda01 100644
--- a/rdkit.spec
+++ b/rdkit.spec
@@ -9,7 +9,7 @@
 
 Name:           rdkit
 Version:        %{year}.%{month}.%{extraver}
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Chemical informatics and machine learning toolkit
 License:        BSD
 URL:            http://www.rdkit.org/
@@ -61,6 +61,7 @@ Patch1:         rdkit-2018.03-do_not_install_sping.patch
 Patch2:         rdkit-2018.03-fix_cmake_files_path.patch
 Patch4:         rdkit-2015.03-dont_install_contrib.patch
 Patch5:         rdkit-2018.03-pg-build.patch
+Patch6:         rdkit-2018.03-pg11-booleans.patch
 
 
 %description
@@ -126,6 +127,7 @@ pushd python3
 %patch1 -p1
 %patch2 -p1
 %patch5 -p1
+%patch6 -p1
 
 rm -rf rdkit/sping
 
@@ -254,6 +256,10 @@ popd
 %{_datadir}/pgsql/extension/rdkit.control
 
 %changelog
+* Mon Oct 22 2018 Petr Kubat <pkubat@redhat.com> - 2017.03.4-2
+- rebuild for PostgreSQL 11
+- use lowercased postgresql boolean definitions
+
 * Tue Sep 25 2018 Gianluca Sforna <giallu@gmail.com> - 2018.03.4-1
 - upstream release 2018.03.4
 - remove python 2 build for Fedora 30