diff --git c/archivers/maxcso/Makefile i/archivers/maxcso/Makefile
new file mode 100644
index 000000000000..9543bc2877e8
--- /dev/null
+++ i/archivers/maxcso/Makefile
@@ -0,0 +1,27 @@
+# $FreeBSD$
+
+PORTNAME=		maxcso
+DISTVERSIONPREFIX=	v
+DISTVERSION=		1.10.0
+CATEGORIES=		archivers
+
+MAINTAINER=	greg@unrelenting.technology
+COMMENT=	Fast ISO to CSO compressor for PSP and PS2 emulators
+
+LICENSE=	ISCL
+
+LIB_DEPENDS=	libuv.so:devel/libuv \
+		liblz4.so:archivers/liblz4 \
+		libzopfli.so:archivers/zopfli
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	unknownbrackets
+
+USES=		gmake pkgconfig compiler:c++11-lang
+
+PLIST_FILES=	bin/${PORTNAME}
+
+do-install:
+	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
+
+.include <bsd.port.mk>
diff --git c/archivers/maxcso/distinfo i/archivers/maxcso/distinfo
new file mode 100644
index 000000000000..57898aea5ffa
--- /dev/null
+++ i/archivers/maxcso/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1541531490
+SHA256 (unknownbrackets-maxcso-v1.10.0_GH0.tar.gz) = 8fc56ab96536c0b12f890b34a83b4c4a5c1013756f8664037313132b7c2515eb
+SIZE (unknownbrackets-maxcso-v1.10.0_GH0.tar.gz) = 3170809
diff --git c/archivers/maxcso/files/patch-Makefile i/archivers/maxcso/files/patch-Makefile
new file mode 100644
index 000000000000..d2e6509c5f05
--- /dev/null
+++ i/archivers/maxcso/files/patch-Makefile
@@ -0,0 +1,23 @@
+--- Makefile.orig	2018-11-08 20:43:35 UTC
++++ Makefile
+@@ -5,6 +5,9 @@ CFLAGS += -W -Wall -Wextra -O2 -Wno-implicit-function-
+ CXXFLAGS += -W -Wall -Wextra -std=c++11 -O2 -Izopfli/src -I7zip -DNDEBUG=1 \
+ 	-Wno-unused-parameter -pthread
+ 
++CFLAGS += $(shell pkg-config --cflags libuv liblz4)
++CXXFLAGS += $(shell pkg-config --cflags libuv liblz4)
++
+ SRC_CXX_SRC = $(wildcard src/*.cpp)
+ SRC_CXX_OBJ = $(SRC_CXX_SRC:.cpp=.o)
+ CLI_CXX_SRC = $(wildcard cli/*.cpp)
+@@ -23,8 +26,8 @@ ZOPFLI_C_OBJ = $(ZOPFLI_C_SRC:.c=.o)
+ %.o: %.c
+ 	$(CC) -c $(CFLAGS) -o $@ $<
+ 
+-maxcso: $(SRC_CXX_OBJ) $(CLI_CXX_OBJ) $(ZOPFLI_C_OBJ) 7zip/7zip.a
+-	$(CXX) -o $@ $(CXXFLAGS) $^ -luv -llz4 -lz
++maxcso: $(SRC_CXX_OBJ) $(CLI_CXX_OBJ) 7zip/7zip.a
++	$(CXX) -o $@ $(CXXFLAGS) $^ $(shell pkg-config --libs libuv liblz4) -lzopfli -lz
+ 
+ 7zip/7zip.a:
+ 	$(MAKE) -C 7zip 7zip.a
diff --git c/archivers/maxcso/pkg-descr i/archivers/maxcso/pkg-descr
new file mode 100644
index 000000000000..08f271ccf0ff
--- /dev/null
+++ i/archivers/maxcso/pkg-descr
@@ -0,0 +1,5 @@
+A fast ISO to CSO compression program for use with PSP (PlayStation Portable)
+and PS2 (PlayStation 2) emulators, which uses multiple algorithms for best
+compression ratio.
+
+WWW: https://github.com/unknownbrackets/maxcso