--- builds/posix/Makefile.in
+++ builds/posix/Makefile.in
@@ -323,8 +323,8 @@
 
 metadata.fdb:	$(RUN_ISQL) $(SRC_ROOT)/dbs/metadata.sql
 	-$(RM) $@
-	$(RUN_ISQL) -q -i $(SRC_ROOT)/dbs/metadata.sql
-	$(RUN_GFIX) -mode read_only $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_ISQL) -q -i $(SRC_ROOT)/dbs/metadata.sql
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_GFIX) -mode read_only $@
 	$(CHMOD) 0444 $@
 
 $(HELP_FDB):	help.fdb
@@ -333,7 +333,7 @@
 	$(CHMOD) 0444 $@
 
 help.fdb:	$(BLD_ROOT)/misc/help.gbak
-	$(RUN_GBAK) -MODE read_only -R $< $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_GBAK) -MODE read_only -R $< $@
 	$(CHMOD) 0444 $@
 
 $(SECURITY_FDB):	security.fdb
@@ -343,18 +343,18 @@
 security.fdb:	$(SRC_ROOT)/dbs/security.sql
 	-$(RM) $@
 	-$(RM) $(SECURITY_TMP)
-	echo create database \'$(SECURITY_TMP)\'\; | $(RUN_ISQL)
-	$(RUN_GFIX) -write async $(SECURITY_TMP)
-	$(RUN_ISQL) -i $^ $(SECURITY_TMP)
+	echo create database \'$(SECURITY_TMP)\'\; | $(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_ISQL)
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_GFIX) -write async $(SECURITY_TMP)
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_ISQL) -i $^ $(SECURITY_TMP)
 	$(CHMOD) a=rw $(SECURITY_TMP)
 	$(CP) $(SECURITY_TMP) $@
-	$(RUN_GFIX) -write sync $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_GFIX) -write sync $@
 
 msg.timestamp:	$(MSG_FILES)
 	-$(RM) msg.fdb
-	echo create database \'msg.fdb\'\; | $(RUN_ISQL)
-	$(RUN_GFIX) -write async msg.fdb
-	for sql in $(MSG_FILES); do (echo $$sql; $(RUN_ISQL) -i $$sql msg.fdb) || exit; done
+	echo create database \'msg.fdb\'\; | $(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_ISQL)
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_GFIX) -write async msg.fdb
+	for sql in $(MSG_FILES); do (echo $$sql; $(LIBO_TUNNEL_LIBRARY_PATH) $(RUN_ISQL) -i $$sql msg.fdb) || exit; done
 	$(TOUCH) $@
 
 
@@ -560,7 +560,7 @@
 message_file:	$(FIREBIRD_MSG)
 
 $(FIREBIRD_MSG):	$(BUILD_FILE) msg.timestamp
-	$(BUILD_FILE) -d msg.fdb -f $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(BUILD_FILE) -d msg.fdb -f $@
 	$(CHMOD_6) $@
 
 $(BUILD_FILE):	$(BUILD_Objects) $(COMMON_LIB)
--- builds/posix/Makefile.in.examples
+++ builds/posix/Makefile.in.examples
@@ -123,8 +123,8 @@
 
 $(EMPLOYEE_DB):	$(EXAMPLES_DEST)/empbuild$(EXEC_EXT) $(INPUT_Sources) $(EXAMPLES_DEST)/isql$(EXEC_EXT)
 	-$(RM) $(EMPLOYEE_DB)
-	./empbuild $(EMPLOYEE_DB)
-	$(GFIX) -write sync $(EMPLOYEE_DB)
+	$(LIBO_TUNNEL_LIBRARY_PATH) ./empbuild $(EMPLOYEE_DB)
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(GFIX) -write sync $(EMPLOYEE_DB)
 	-$(CHMOD_6) $(EMPLOYEE_DB)
 
 # To get past the fact isql is called from the programs, we create a local link in this directory
@@ -140,7 +140,7 @@
 
 $(EXAMPLES_DEST)/empbuild.fdb : $(EXAMPLES_DEST)/empddl.sql $(EXAMPLES_DEST)/empbld.sql $(EXAMPLES_DEST)/isql$(EXEC_EXT)
 	-$(RM) $(EXAMPLES_DEST)/empbuild.fdb
-	$(EXAMPLES_DEST)/isql$(EXEC_EXT) -i empbld.sql
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(EXAMPLES_DEST)/isql$(EXEC_EXT) -i empbld.sql
 
 # The chain for intlemp.fdb is the same a script file to create an empty database
 # to allow a .e program to be compiled, to then create and populate with data
@@ -158,7 +158,7 @@
 
 $(EXAMPLES_DEST)/intlbuild.fdb : $(EXAMPLES_DEST)/intlddl.sql $(EXAMPLES_DEST)/intlbld.sql $(EXAMPLES_DEST)/isql$(EXEC_EXT)
 	-$(RM) intlbuild.fdb
-	$(EXAMPLES_DEST)/isql$(EXEC_EXT) -i intlbld.sql
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(EXAMPLES_DEST)/isql$(EXEC_EXT) -i intlbld.sql
 
 
 $(EXAMPLES_DEST)/%.sql: $(EXAMPLES_SRC)/empbuild/%.sql
--- builds/posix/make.rules
+++ builds/posix/make.rules
@@ -68,17 +68,17 @@
 .SUFFIXES: .c .e .epp .cpp
 
 .e.c:
-	$(GPRE_CURRENT) $(GPRE_FLAGS) $< $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(GPRE_CURRENT) $(GPRE_FLAGS) $< $@
 
 
 $(OBJ)/jrd/%.cpp: $(SRC_ROOT)/jrd/%.epp
-	$(GPRE_CURRENT) $(JRD_GPRE_FLAGS) $(firstword $<) $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(GPRE_CURRENT) $(JRD_GPRE_FLAGS) $(firstword $<) $@
 
 $(OBJ)/isql/%.cpp: $(SRC_ROOT)/isql/%.epp
-	$(GPRE_CURRENT) $(ISQL_GPRE_FLAGS) $< $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(GPRE_CURRENT) $(ISQL_GPRE_FLAGS) $< $@
 
 $(OBJ)/%.cpp: $(SRC_ROOT)/%.epp
-	$(GPRE_CURRENT) $(GPRE_FLAGS) $(firstword $<) $@
+	$(LIBO_TUNNEL_LIBRARY_PATH) $(GPRE_CURRENT) $(GPRE_FLAGS) $(firstword $<) $@
 
 
 .SUFFIXES: .lo .o .cpp .c
--- src/common/classes/alloc.cpp
+++ src/common/classes/alloc.cpp
@@ -2187,7 +2187,7 @@
 
 void* MemPool::allocRaw(size_t size)
 {
-#ifndef USE_VALGRIND
+#if !(defined USE_VALGRIND || defined USE_ASAN)
 	if (size == DEFAULT_ALLOCATION)
 	{
 		MutexLockGuard guard(*cache_mutex, "MemPool::allocRaw");
@@ -2267,7 +2267,7 @@
 
 void MemPool::releaseRaw(bool destroying, void* block, size_t size, bool use_cache) throw ()
 {
-#ifndef USE_VALGRIND
+#if !(defined USE_VALGRIND || defined USE_ASAN)
 	if (use_cache && (size == DEFAULT_ALLOCATION))
 	{
 		MutexLockGuard guard(*cache_mutex, "MemPool::releaseRaw");
@@ -2277,7 +2277,7 @@
 			return;
 		}
 	}
-#else
+#elif defined USE_VALGRIND
 	// Set access protection for block to prevent memory from deleted pool being accessed
 	int handle = /* //VALGRIND_MAKE_NOACCESS */ VALGRIND_MAKE_MEM_DEFINED(block, size);
 
--- src/common/classes/alloc.h
+++ src/common/classes/alloc.h
@@ -295,40 +295,60 @@
 
 // operators new and delete
 
+#if !defined USE_ASAN
 inline void* operator new(size_t s ALLOC_PARAMS)
 {
 	return MemoryPool::globalAlloc(s ALLOC_PASS_ARGS);
 }
 inline void* operator new[](size_t s ALLOC_PARAMS)
 {
 	return MemoryPool::globalAlloc(s ALLOC_PASS_ARGS);
 }
+#endif
 
 inline void* operator new(size_t s, Firebird::MemoryPool& pool ALLOC_PARAMS)
 {
+#if defined USE_ASAN
+	return operator new(s);
+#else
 	return pool.allocate(s ALLOC_PASS_ARGS);
+#endif
 }
 inline void* operator new[](size_t s, Firebird::MemoryPool& pool ALLOC_PARAMS)
 {
+#if defined USE_ASAN
+	return operator new[](s);
+#else
 	return pool.allocate(s ALLOC_PASS_ARGS);
+#endif
 }
 
+#if !defined USE_ASAN
 inline void operator delete(void* mem ALLOC_PARAMS) throw()
 {
 	MemoryPool::globalFree(mem);
 }
 inline void operator delete[](void* mem ALLOC_PARAMS) throw()
 {
 	MemoryPool::globalFree(mem);
 }
+#endif
 
 inline void operator delete(void* mem, Firebird::MemoryPool& pool ALLOC_PARAMS) throw()
 {
+#if defined USE_ASAN
+	return operator delete(mem);
+#else
 	MemoryPool::globalFree(mem);
+#endif
 }
 inline void operator delete[](void* mem, Firebird::MemoryPool& pool ALLOC_PARAMS) throw()
 {
+#if defined USE_ASAN
+	return operator delete[](mem);
+#else
 	MemoryPool::globalFree(mem);
+#endif
 }
 
 #ifdef DEBUG_GDS_ALLOC
--- src/include/firebird.h
+++ src/include/firebird.h
@@ -38,8 +38,17 @@
 #include "gen/autoconfig.h"
 #endif
 
+#if defined __clang__
+//#if __has_feature(address_sanitizer)
+#define USE_ASAN
+//#endif
+#endif
+#if defined __SANITIZE_ADDRESS__
+#define USE_ASAN
+#endif
+
 // Using our debugging code is pointless when we may use Valgrind features
-#if defined(DEV_BUILD) && !defined(USE_VALGRIND)
+#if defined(DEV_BUILD) && !(defined(USE_VALGRIND) || defined(USE_ASAN))
 #define DEBUG_GDS_ALLOC
 #endif
 
--- src/jrd/SimilarToMatcher.h
+++ src/jrd/SimilarToMatcher.h
@@ -338,7 +338,7 @@
 		private:
 			static const unsigned INCREASE_FACTOR = 50;
 			unsigned size;
-			AutoPtr<UCHAR> data;
+			AutoPtr<UCHAR, ArrayDelete> data;
 			T* end;
 		};
 #endif	// RECURSIVE_SIMILAR
--- configure.orig	2018-06-03 17:44:50.152951348 +0200
+++ configure	2018-06-03 17:45:11.708907807 +0200
@@ -18479,11 +18479,11 @@
 #ifdef __cplusplus
 extern "C"
 #endif
-char dlopen ();
+char dlsym ();
 int
 main ()
 {
-return dlopen ();
+return dlsym ();
   ;
   return 0;
 }