diff --git a/Configure b/Configure
index dac7183f69..8d8cb51ac1 100755
--- a/Configure
+++ b/Configure
@@ -172,6 +172,7 @@ my %table=(
 "debug-ben-openbsd-debug","gcc:-DBN_DEBUG -DREF_CHECK -DCONF_DEBUG -DBN_CTX_DEBUG -DCRYPTO_MDEBUG -DPEDANTIC -DDEBUG_SAFESTACK -DOPENSSL_OPENBSD_DEV_CRYPTO -DOPENSSL_NO_ASM -g3 -O2 -pedantic -Wall -Wshadow -Werror -pipe::(unknown)::::",
 "debug-ben-debug",	"gcc:$gcc_devteam_warn -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DOPENSSL_NO_HW_PADLOCK -g3 -O2 -pipe::(unknown)::::::",
 "debug-ben-debug-64",	"gcc:$gcc_devteam_warn -Wno-error=overlength-strings -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -g3 -O3 -pipe::${BSDthreads}:::SIXTY_FOUR_BIT_LONG RC4_CHUNK DES_INT DES_UNROLL:${x86_64_asm}:elf:dlfcn:bsd-gcc-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"debug-ben-debug-64-clang",	"clang:$gcc_devteam_warn -Wno-error=overlength-strings -Wno-error=extended-offsetof -Qunused-arguments -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -g3 -O3 -pipe::${BSDthreads}:::SIXTY_FOUR_BIT_LONG RC4_CHUNK DES_INT DES_UNROLL:${x86_64_asm}:elf:dlfcn:bsd-gcc-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
 "debug-ben-debug-64-noopt",	"gcc:$gcc_devteam_warn -Wno-error=overlength-strings -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -g3 -pipe::${BSDthreads}:::SIXTY_FOUR_BIT_LONG RC4_CHUNK DES_INT DES_UNROLL:${x86_64_asm}:elf:dlfcn:bsd-gcc-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
 "debug-ben-macos",	"cc:$gcc_devteam_warn -DOPENSSL_NO_ASM -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -arch i386 -O3 -DL_ENDIAN -g3 -pipe::(unknown)::::::",
 "debug-ben-no-opt",	"gcc: -Wall -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations -DDEBUG_SAFESTACK -DCRYPTO_MDEBUG -Werror -DL_ENDIAN -DTERMIOS -Wall -g3::(unknown)::::::",