Index: head/math/Makefile
===================================================================
--- head/math/Makefile
+++ head/math/Makefile
@@ -263,6 +263,7 @@
     SUBDIR += hs-statistics
     SUBDIR += hs-vector-space
     SUBDIR += igraph
+    SUBDIR += intervaltree
     SUBDIR += ipopt
     SUBDIR += ised
     SUBDIR += jacal
Index: head/math/intervaltree/Makefile
===================================================================
--- head/math/intervaltree/Makefile
+++ head/math/intervaltree/Makefile
@@ -0,0 +1,27 @@
+# $FreeBSD$
+
+PORTNAME=	intervaltree
+DISTVERSION=	g20151213
+CATEGORIES=	wip math
+
+MAINTAINER=	jwb@FreeBSD.org
+COMMENT=	Minimal C++ interval tree implementation
+
+LICENSE=	MIT
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	ekg
+GH_TAGNAME=	8fc4be91866237995e1105689d84bece619f4663
+
+INSTALL_TARGET=	install-strip
+PLIST_FILES=	bin/interval_tree_test include/${PORTNAME}/IntervalTree.h
+
+.include <bsd.port.pre.mk>
+
+.if ${ARCH} == i386
+post-patch:
+	${REINPLACE_CMD} -e 's|<bool, unsigned long>|<bool, unsigned int>|g' \
+		${WRKSRC}/interval_tree_test.cpp
+.endif
+
+.include <bsd.port.post.mk>
Index: head/math/intervaltree/distinfo
===================================================================
--- head/math/intervaltree/distinfo
+++ head/math/intervaltree/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1523601658
+SHA256 (ekg-intervaltree-g20151213-8fc4be91866237995e1105689d84bece619f4663_GH0.tar.gz) = 126f0d0d313e43cd32a07b3a2e573112f4a0e69f5d1618fa38185b93c0f6a696
+SIZE (ekg-intervaltree-g20151213-8fc4be91866237995e1105689d84bece619f4663_GH0.tar.gz) = 71387
Index: head/math/intervaltree/pkg-descr
===================================================================
--- head/math/intervaltree/pkg-descr
+++ head/math/intervaltree/pkg-descr
@@ -0,0 +1,6 @@
+An interval tree can be used to efficiently find a set of numeric intervals
+overlapping or containing another interval.  This library provides a basic
+implementation of an interval tree using C++ templates, allowing the insertion
+of arbitrary types into the tree.
+
+WWW: https://github.com/ekg/intervaltree