diff --git a/devel/zmac/Makefile b/devel/zmac/Makefile
new file mode 100644
index 00000000000..c7b0f1e3148
--- /dev/null
+++ b/devel/zmac/Makefile
@@ -0,0 +1,27 @@
+# $OpenBSD: Makefile,v 1.1.1.1 2020/07/03 15:24:22 bcallah Exp $
+
+COMMENT =	Z-80 macro cross assembler
+DISTNAME =	zmac-20200607
+CATEGORIES =	devel
+
+HOMEPAGE =	http://48k.ca/zmac.html
+MAINTAINER =	Brian Callahan <bcallah@openbsd.org>
+
+# Public Domain
+PERMIT_PACKAGE =	Yes
+
+WANTLIB += ${COMPILER_LIBCXX} c m
+
+MASTER_SITES =	https://mirrors.nycbug.org/pub/distfiles/
+
+COMPILER =	base-clang ports-gcc
+
+ALL_TARGET =	zmac
+
+NO_TEST =	Yes
+
+# No install routine.
+do-install:
+	${INSTALL_PROGRAM} ${WRKSRC}/zmac ${PREFIX}/bin
+
+.include <bsd.port.mk>
diff --git a/devel/zmac/distinfo b/devel/zmac/distinfo
new file mode 100644
index 00000000000..0f945d69cfa
--- /dev/null
+++ b/devel/zmac/distinfo
@@ -0,0 +1,2 @@
+SHA256 (zmac-20200607.tar.gz) = AXl7cpZZEvrOH5MO7jfVCyB/PjIOMkaqx1LjLk47GXk=
+SIZE (zmac-20200607.tar.gz) = 177599
diff --git a/devel/zmac/pkg/DESCR b/devel/zmac/pkg/DESCR
new file mode 100644
index 00000000000..97d0416aa79
--- /dev/null
+++ b/devel/zmac/pkg/DESCR
@@ -0,0 +1,12 @@
+zmac is a Z-80 macro cross-assembler. It has all the features you'd
+expect. It assembles the specified input file (with a '.z' extension if
+there is no pre-existing extension and the file as given doesn't exist)
+and produces program output in many different formats. It also produces
+a nicely-formatted listing of the machine code and cycle counts
+alongside the source in a ".lst" file.
+
+Undocumented Z-80 instructions are supported as well as 8080 code.
+
+zmac strives to be a powerful assembler with expressions familiar to C
+programmers while providing good backward compatibility with original
+assemblers such as Edtasm, MRAS and Macro-80.
diff --git a/devel/zmac/pkg/PLIST b/devel/zmac/pkg/PLIST
new file mode 100644
index 00000000000..10b6c758ed8
--- /dev/null
+++ b/devel/zmac/pkg/PLIST
@@ -0,0 +1,2 @@
+@comment $OpenBSD: PLIST,v 1.1.1.1 2020/07/03 15:24:22 bcallah Exp $
+@bin bin/zmac