diff --git c/math/cln/Makefile i/math/cln/Makefile
index 52cdbd331088..1f6bde635dc4 100644
--- c/math/cln/Makefile
+++ i/math/cln/Makefile
@@ -21,8 +21,6 @@ USE_LDCONFIG=	yes
 
 INFO=		cln
 
-BROKEN_aarch64=	Fails to compile: error: declaration of divu_64_rest in global scope conflicts with declaration with C language linkage
-
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == aarch64 || ${ARCH} == armv6 || ${ARCH} == armv7
diff --git c/math/cln/files/patch-include_cln_exception.h i/math/cln/files/patch-include_cln_exception.h
deleted file mode 100644
index ca3ed8763c2b..000000000000
--- c/math/cln/files/patch-include_cln_exception.h
+++ /dev/null
@@ -1,10 +0,0 @@
---- include/cln/exception.h.orig	2013-09-12 12:47:22.000000000 +0000
-+++ include/cln/exception.h	2013-09-12 12:43:48.000000000 +0000
-@@ -4,6 +4,7 @@
- #define _CL_EXCEPTION_H
- 
- #include <stdexcept>
-+#include <string>
- 
- namespace cln {
- 
diff --git c/math/cln/files/patch-src_base_cl__low.h i/math/cln/files/patch-src_base_cl__low.h
index 7177af422b36..ea20d9b07f64 100644
--- c/math/cln/files/patch-src_base_cl__low.h
+++ i/math/cln/files/patch-src_base_cl__low.h
@@ -27,3 +27,12 @@
  #endif
  #if defined(__GNUC__) && defined(__sparc64__) && !defined(NO_ASM)
    #define divu_3232_3232(x,y,q_zuweisung,r_zuweisung)  \
+@@ -979,7 +979,7 @@ inline uint32 mulu32_unchecked (uint32 arg1, uint32 ar
+   // Workaround MSVC compiler bug.
+ } extern "C" uint64 divu_64_rest; namespace cln {         // -> Rest r
+ #else
+-  extern "C" uint64 divu_64_rest;                         // -> Rest r
++}  extern "C" uint64 divu_64_rest; namespace cln {        // -> Rest r
+ #endif
+   #define divu_6464_6464(x,y,q_zuweisung,r_zuweisung)  \
+     { q_zuweisung divu_6464_6464_(x,y); r_zuweisung divu_64_rest; }
diff --git c/math/cln/files/patch-src_base_low_cl__low__div.cc i/math/cln/files/patch-src_base_low_cl__low__div.cc
new file mode 100644
index 000000000000..fa6c2c78daf9
--- /dev/null
+++ i/math/cln/files/patch-src_base_low_cl__low__div.cc
@@ -0,0 +1,11 @@
+--- src/base/low/cl_low_div.cc.orig	2018-06-23 21:13:46 UTC
++++ src/base/low/cl_low_div.cc
+@@ -207,7 +207,7 @@ uint32 divu_6432_3232_(uint32 xhi, uint32 xlo, uint32 
+ #endif
+ 
+ #ifdef NEED_VAR_divu_64_rest
+-uint64 divu_64_rest;
++extern "C" uint64 divu_64_rest;
+ #endif
+ 
+ #ifdef NEED_FUNCTION_divu_6464_6464_
diff --git c/math/cln/files/patch-src_base_low_cl__low__mul.cc i/math/cln/files/patch-src_base_low_cl__low__mul.cc
new file mode 100644
index 000000000000..ecdb7c70891c
--- /dev/null
+++ i/math/cln/files/patch-src_base_low_cl__low__mul.cc
@@ -0,0 +1,16 @@
+--- src/base/low/cl_low_mul.cc.orig	2018-06-23 21:15:19 UTC
++++ src/base/low/cl_low_mul.cc
+@@ -50,11 +50,11 @@ uint64 mulu32_w (uint32 arg1, uint32 arg2)
+ 
+ 
+ #ifdef NEED_VAR_mulu64_high
+-uint64 mulu64_high;
++extern "C" uint64 mulu64_high;
+ #endif
+ 
+ #ifdef NEED_FUNCTION_mulu64_
+-uint64 mulu64_high;
++extern "C" uint64 mulu64_high;
+ namespace cln {
+ extern "C" uint64 mulu64_ (uint64 x, uint64 y);
+ uint64 mulu64_ (uint64 x, uint64 y)