diff --git a/audio/libadplug/Makefile b/audio/libadplug/Makefile
index 71f711ebc401..6fe95fbf4b44 100644
--- a/audio/libadplug/Makefile
+++ b/audio/libadplug/Makefile
@@ -14,7 +14,8 @@ LICENSE=	GPLv2
 
 LIB_DEPENDS=	libbinio.so:devel/libbinio
 
-USES=		autoreconf libtool makeinfo pathfix pkgconfig
+USES=		autoreconf compiler:c++11-lang libtool makeinfo pathfix \
+		pkgconfig
 USE_CSTD=	gnu89
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
diff --git a/audio/ocp/Makefile b/audio/ocp/Makefile
index 807ba7a27849..2ee90b3cbe7d 100644
--- a/audio/ocp/Makefile
+++ b/audio/ocp/Makefile
@@ -23,8 +23,8 @@ LIB_DEPENDS=	libid3tag.so:audio/libid3tag \
 		libsidplay.so:audio/libsidplay \
 		libvorbis.so:audio/libvorbis
 
-USES=		gmake gnome iconv localbase:ldflags makeinfo ncurses pkgconfig \
-		tar:xz
+USES=		compiler:c11 gmake gnome iconv localbase:ldflags makeinfo \
+		ncurses pkgconfig tar:xz
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	mywave82
diff --git a/audio/ocp/files/patch-playym_lzh_lzh.h b/audio/ocp/files/patch-playym_lzh_lzh.h
new file mode 100644
index 000000000000..aacb1e026372
--- /dev/null
+++ b/audio/ocp/files/patch-playym_lzh_lzh.h
@@ -0,0 +1,10 @@
+--- playym/lzh/lzh.h.orig	2020-06-17 18:26:50 UTC
++++ playym/lzh/lzh.h
+@@ -41,6 +41,7 @@
+ #ifndef LZH_H
+ #define LZH_H
+ 
++#include <sys/types.h>
+ 
+ #define BUFSIZE (1024 * 4)
+ 
diff --git a/devel/libbinio/Makefile b/devel/libbinio/Makefile
index 495e1706fc68..8abfbf416f2f 100644
--- a/devel/libbinio/Makefile
+++ b/devel/libbinio/Makefile
@@ -11,7 +11,7 @@ COMMENT=	Binary I/O stream class library
 
 LICENSE=	LGPL21
 
-USES=		autoreconf libtool pathfix
+USES=		autoreconf compiler:c11 libtool pathfix
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes