diff --git a/dev-libs/isl/isl-0.13.recipe b/dev-libs/isl/isl-0.16.1.recipe
similarity index 82%
rename from dev-libs/isl/isl-0.13.recipe
rename to dev-libs/isl/isl-0.16.1.recipe
index c204fd367..7799da48a 100644
--- a/dev-libs/isl/isl-0.13.recipe
+++ b/dev-libs/isl/isl-0.16.1.recipe
@@ -13,14 +13,14 @@ COPYRIGHT="2011 Sven Verdoolaege
 LICENSE="MIT"
 REVISION="1"
 SOURCE_URI="http://isl.gforge.inria.fr/isl-$portVersion.tar.bz2"
-CHECKSUM_SHA256="7265fd897b7f9147fde76560f28ed18f2c20e5f5da7f4bd9d0e01f8a713401f1"
+CHECKSUM_SHA256="412538bb65c799ac98e17e8cfcdacbb257a57362acfaaff254b0fcae970126d2"
 
 ARCHITECTURES="!x86_gcc2 x86 x86_64"
 SECONDARY_ARCHITECTURES="x86"
 
 PROVIDES="
 	isl$secondaryArchSuffix = $portVersion compat >= 0.12
-	lib:libisl$secondaryArchSuffix = 13.0.0 compat >= 13
+	lib:libisl$secondaryArchSuffix = 15.1.1 compat >= 15
 	"
 REQUIRES="
 	haiku$secondaryArchSuffix
@@ -29,11 +29,14 @@ REQUIRES="
 
 PROVIDES_devel="
 	isl${secondaryArchSuffix}_devel = $portVersion compat >= 0.12
-	devel:libisl$secondaryArchSuffix = 13.0.0 compat >= 13
+	devel:libisl$secondaryArchSuffix = 15.1.1 compat >= 15
 	"
 REQUIRES_devel="
 	isl$secondaryArchSuffix == $portVersion base
 	"
+CONFLICTS_devel="
+	isl13${secondaryArchSuffix}_devel
+	"
 
 BUILD_REQUIRES="
 	haiku${secondaryArchSuffix}_devel
@@ -60,6 +63,9 @@ BUILD()
 INSTALL()
 {
 	make install
+	
+	# remove libtool file
+	rm $libDir/libisl.la
 
 	prepareInstalledDevelLibs libisl
 	fixPkgconfig
@@ -68,3 +74,8 @@ INSTALL()
 	packageEntries devel \
 		$developDir
 }
+
+TEST()
+{
+	make check
+}
diff --git a/dev-libs/isl/isl-0.14.recipe b/dev-libs/isl/isl13-0.14.recipe
similarity index 86%
rename from dev-libs/isl/isl-0.14.recipe
rename to dev-libs/isl/isl13-0.14.recipe
index 1172b1a03..9cfb36d83 100644
--- a/dev-libs/isl/isl-0.14.recipe
+++ b/dev-libs/isl/isl13-0.14.recipe
@@ -14,12 +14,13 @@ LICENSE="MIT"
 REVISION="1"
 SOURCE_URI="http://isl.gforge.inria.fr/isl-$portVersion.tar.bz2"
 CHECKSUM_SHA256="7e3c02ff52f8540f6a85534f54158968417fd676001651c8289c705bd0228f36"
+SOURCE_DIR="isl-$portVersion"
 
 ARCHITECTURES="!x86_gcc2 x86 x86_64"
 SECONDARY_ARCHITECTURES="x86"
 
 PROVIDES="
-	isl$secondaryArchSuffix = $portVersion compat >= 0.12
+	isl13$secondaryArchSuffix = $portVersion compat >= 0.12
 	lib:libisl$secondaryArchSuffix = 13.1.0 compat >= 13
 	"
 REQUIRES="
@@ -28,11 +29,11 @@ REQUIRES="
 	"
 
 PROVIDES_devel="
-	isl${secondaryArchSuffix}_devel = $portVersion compat >= 0.12
+	isl13${secondaryArchSuffix}_devel = $portVersion compat >= 0.12
 	devel:libisl$secondaryArchSuffix = 13.1.0 compat >= 13
 	"
 REQUIRES_devel="
-	isl$secondaryArchSuffix == $portVersion base
+	isl13$secondaryArchSuffix == $portVersion base
 	"
 
 BUILD_REQUIRES="
@@ -61,6 +62,9 @@ INSTALL()
 {
 	make install
 
+	# remove libtool file
+	rm $libDir/libisl.la
+
 	prepareInstalledDevelLibs libisl
 	fixPkgconfig