diff --git a/math/p5-Math-GSL/Makefile b/math/p5-Math-GSL/Makefile
index 197fe823a7d3..ec5272c73f0b 100644
--- a/math/p5-Math-GSL/Makefile
+++ b/math/p5-Math-GSL/Makefile
@@ -12,8 +12,7 @@ WWW=		https://metacpan.org/release/Math-GSL
 LICENSE=	ART10 GPLv1+
 LICENSE_COMB=	dual
 
-BUILD_DEPENDS=	p5-PkgConfig>=0.07720:devel/p5-PkgConfig \
-	        p5-Alien-GSL>=1.01:math/p5-Alien-GSL
+BUILD_DEPENDS=	p5-PkgConfig>=0.07720:devel/p5-PkgConfig
 LIB_DEPENDS=	libgsl.so:math/gsl
 TEST_DEPENDS=	p5-Test-Class>=0.12:devel/p5-Test-Class \
 		p5-Test-Exception>=0.21:devel/p5-Test-Exception \
@@ -23,6 +22,9 @@ TEST_DEPENDS=	p5-Test-Class>=0.12:devel/p5-Test-Class \
 USES=		perl5
 USE_PERL5=	modbuild
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|' ${WRKSRC}/Build.PL
+
 post-install:
 	${FIND} ${STAGEDIR}${PREFIX}/${SITE_ARCH_REL}/auto/Math/GSL/ -name "*.so" -exec ${STRIP_CMD} {} +
 
diff --git a/math/p5-Math-GSL/files/patch-Build.PL b/math/p5-Math-GSL/files/patch-Build.PL
new file mode 100644
index 000000000000..b9604af7db00
--- /dev/null
+++ b/math/p5-Math-GSL/files/patch-Build.PL
@@ -0,0 +1,32 @@
+--- Build.PL.orig	2021-07-26 16:28:55 UTC
++++ Build.PL
+@@ -26,7 +26,6 @@ use File::Spec::Functions qw/:ALL/;
+ use GSLBuilder;
+ use Ver2Func;
+ use File::Spec::Functions qw/:ALL/;
+-use Alien::GSL;
+ 
+ our $MIN_GSL_VERSION = "1.15";
+ 
+@@ -143,7 +142,6 @@ my $builder = GSLBuilder->new(
+     configure_requires => {
+         'PkgConfig'       => '0.07720',
+         'Module::Build'   => '0.38',
+-        'Alien::GSL'      => '1.01',
+     },
+     swig_version          => $swig_version,
+     current_version       => $gsl_conf->{gsl_version},
+@@ -251,11 +249,8 @@ sub check_alien_gsl_share_dir {
+ }
+ 
+ sub check_alien_gsl_share_dir {
+-    if (Alien::GSL->install_type eq "share") {
+-        my $dist_dir = Alien::GSL->dist_dir;
+-        my $bin_dir = File::Spec->catfile( $dist_dir, "bin" );
+-        $ENV{PATH} .= ":$bin_dir";
+-    }
++    my $bin_dir = File::Spec->catfile( "%%LOCALBASE%%", "bin" );
++    $ENV{PATH} .= ":$bin_dir";
+ }
+ 
+ sub check_gsl_version_pkgconfig {