diff --git a/audio/iir1/Makefile b/audio/iir1/Makefile
new file mode 100644
index 00000000000..40025cfe748
--- /dev/null
+++ b/audio/iir1/Makefile
@@ -0,0 +1,21 @@
+COMMENT =	DSP IIR realtime filter library
+
+V =		1.9.5
+PKGNAME =	iir1-${V}
+DIST_TUPLE +=	github berndporr iir1 ${V} .
+
+SHARED_LIBS =	iir	0.0	# 1.9.5
+
+CATEGORIES =	audio
+MAINTAINER =	Thomas Frohwein <thfr@openbsd.org>
+
+# MIT
+PERMIT_PACKAGE =	Yes
+
+WANTLIB += ${COMPILER_LIBCXX} m
+
+COMPILER =		base-clang ports-gcc base-gcc
+
+MODULES =		devel/cmake
+
+.include <bsd.port.mk>
diff --git a/audio/iir1/distinfo b/audio/iir1/distinfo
new file mode 100644
index 00000000000..e6d5e6c7dd9
--- /dev/null
+++ b/audio/iir1/distinfo
@@ -0,0 +1,2 @@
+SHA256 (berndporr-iir1-1.9.5.tar.gz) = vrFhQuCOX2gBDG5QFN6iJ26km3GiWEOe/wnF7j94HYg=
+SIZE (berndporr-iir1-1.9.5.tar.gz) = 2115864
diff --git a/audio/iir1/pkg/DESCR b/audio/iir1/pkg/DESCR
new file mode 100644
index 00000000000..1682cf6d213
--- /dev/null
+++ b/audio/iir1/pkg/DESCR
@@ -0,0 +1,13 @@
+An infinite impulse response (IIR) filter library for Linux, Mac OSX and Windows
+which implements Butterworth, RBJ, Chebychev filters and can easily import
+coefficients generated by Python (scipy).
+
+The filter processes the data sample by sample for realtime processing.
+
+It uses templates to allocate the required memory so that it can run without any
+malloc / new commands. Memory is allocated at compile time so that there is
+never the risk of memory leaks.
+
+All realtime filter code is in the header files which guarantees efficient
+integration into the main program and the compiler can optimise both filter code
+and main program at the same time.
diff --git a/audio/iir1/pkg/PLIST b/audio/iir1/pkg/PLIST
new file mode 100644
index 00000000000..4df41f3e002
--- /dev/null
+++ b/audio/iir1/pkg/PLIST
@@ -0,0 +1,24 @@
+include/Iir.h
+include/iir/
+include/iir/Biquad.h
+include/iir/Butterworth.h
+include/iir/Cascade.h
+include/iir/ChebyshevI.h
+include/iir/ChebyshevII.h
+include/iir/Common.h
+include/iir/Custom.h
+include/iir/Layout.h
+include/iir/MathSupplement.h
+include/iir/PoleFilter.h
+include/iir/RBJ.h
+include/iir/State.h
+include/iir/Types.h
+lib/cmake/
+lib/cmake/iir/
+lib/cmake/iir/iirConfig.cmake
+lib/cmake/iir/iirConfigVersion.cmake
+lib/cmake/iir/iirTargets${MODCMAKE_BUILD_SUFFIX}
+lib/cmake/iir/iirTargets.cmake
+@lib lib/libiir.so.${LIBiir_VERSION}
+@static-lib lib/libiir_static.a
+lib/pkgconfig/iir.pc