diff --git a/math/openspecfun/Portfile b/math/openspecfun/Portfile
new file mode 100644
index 00000000000..8ebcc5e55b6
--- /dev/null
+++ b/math/openspecfun/Portfile
@@ -0,0 +1,35 @@
+# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
+
+PortSystem          1.0
+PortGroup           cmake 1.0
+PortGroup           compilers 1.0
+PortGroup           github 1.0
+
+github.setup        JuliaMath openspecfun 0.5.7 v
+github.tarball_from archive
+revision            0
+categories          math
+license             {MIT public-domain}
+maintainers         {mps @Schamschula} openmaintainer
+description         The OpenSpecFun library largely includes two libraries, AMOS and \
+                    Faddeeva.
+long_description    {*}${description}
+homepage            https://github.com/JuliaMath/openspecfun
+
+checksums           rmd160  46d95b038ba5622645e78fe6efa4dbe6e7d179ad \
+                    sha256  6209413bc5291f4aad68903fc7851a18ddc94d3432ee0dd1b69e02dc370ece2a \
+                    size    107827
+
+compilers.choose    fc f77 f90
+compilers.setup     require_fortran
+
+post-configure {
+    # openspecfun will definitely use a real compiler name, not gfortran.
+    set myf [fortran_compiler_name [fortran_variant_name]]
+
+    reinplace "s|gfortran|$myf|" \
+        ${worksrcpath}/Make.inc \
+        ${worksrcpath}/CMakeFiles/openspecfun-shared.dir/build.make \
+        ${worksrcpath}/CMakeFiles/openspecfun-shared.dir/link.txt \
+        ${worksrcpath}/CMakeFiles/openspecfun-static.dir/build.make
+}