diff --git a/system/devel/isl/files/isl-0.19-gdb-autoload-dir.patch b/system/devel/isl/files/isl-0.19-gdb-autoload-dir.patch
new file mode 100644
index 00000000..0aa16480
--- /dev/null
+++ b/system/devel/isl/files/isl-0.19-gdb-autoload-dir.patch
@@ -0,0 +1,18 @@
+diff -Naur isl-0.19.orig/Makefile.in isl-0.19/Makefile.in
+--- isl-0.19.orig/Makefile.in	2018-03-03 11:32:15.000000000 -0500
++++ isl-0.19/Makefile.in	2018-03-10 17:29:30.039182728 -0500
+@@ -2269,10 +2269,10 @@
+ 	case $$libisl in \
+ 	'') echo Cannot find isl library name. GDB bindings not installed.;; \
+ 	*) echo $(INSTALL_DATA) $(srcdir)/libisl-gdb.py \
+-		$(DESTDIR)$(libdir)/$$libisl-gdb.py; \
+-	test -z "$(libdir)" || $(MKDIR_P) "$(DESTDIR)$(libdir)"; \
++		$(DESTDIR)$(prefix)/share/gdb/auto-load$(libdir)/$$libisl-gdb.py; \
++	test -z "$(libdir)" || $(MKDIR_P) "$(DESTDIR)$(prefix)/share/gdb/auto-load$(libdir)"; \
+ 	$(INSTALL_DATA) $(srcdir)/libisl-gdb.py \
+-	    $(DESTDIR)$(libdir)/$$libisl-gdb.py; \
++	    $(DESTDIR)$(prefix)/share/gdb/auto-load$(libdir)/$$libisl-gdb.py; \
+ 	esac
+ 
+ uninstall-local:
+ 
diff --git a/system/devel/isl/pspec.xml b/system/devel/isl/pspec.xml
index f24b533c..babbedec 100644
--- a/system/devel/isl/pspec.xml
+++ b/system/devel/isl/pspec.xml
@@ -12,12 +12,12 @@
         <IsA>library</IsA>
         <Summary>Integer Set Library</Summary>
         <Description>isl is a library for manipulating sets and relations of integer points bounded by linear constraints.</Description>
-        <Archive sha1sum="bbffc5a2b05e4f0c97e882f96c448504491dc4ed" type="tarbz2">http://isl.gforge.inria.fr/isl-0.18.tar.bz2</Archive>
+        <Archive sha1sum="33e366d59d32330432b5c7f2d0c2fb6664eff224" type="tarbz2">http://isl.gforge.inria.fr/isl-0.21.tar.bz2</Archive>
         <BuildDependencies>
             <Dependency>gmp-devel</Dependency>
         </BuildDependencies>
         <Patches>
-            <Patch>isl-0.07-gdb-autoload-dir.patch</Patch>
+            <Patch>isl-0.19-gdb-autoload-dir.patch</Patch>
         </Patches>
     </Source>
 
@@ -46,6 +46,13 @@
     </Package>
 
     <History>
+        <Update release="5">
+            <Date>2019-12-15</Date>
+            <Version>0.21</Version>
+            <Comment>Version bump.</Comment>
+            <Name>Mustafa Cinasal</Name>
+            <Email>muscnsl@gmail.com</Email>
+        </Update>
         <Update release="4">
             <Date>2018-07-15</Date>
             <Version>0.18</Version>