diff --git a/GNUmakefile b/GNUmakefile
index 752ab37..9e2a596 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -17,9 +17,27 @@ USR_CXXFLAGS += -std=c++17
 OPT_CXXFLAGS_YES = -O3
 
 # dependencies
-ECmasterECMC_VERSION = v1.1.0
 ecmc_VERSION = 10.0
 
+# ethercat
+#   debian 12
+EC_MASTER_VER = 1.6.3
+EC_BASE_PATH = /ioc/NeedfulThings/EtherCAT/4epics/${EC_MASTER_VER}/
+USR_CXXFLAGS_deb12-x86_64 += -I${EC_BASE_PATH}${T_A}/include/
+USR_CXXFLAGS_deb12-x86_64 += -L${EC_BASE_PATH}${T_A}/lib/
+
+LIB_SYS_LIBS += ethercat
+USR_LDFLAGS_deb12-x86_64 += -Wl,-rpath=${EC_BASE_PATH}${T_A}/lib/
+USR_LDFLAGS_deb12-x86_64 +=         -L ${EC_BASE_PATH}${T_A}/lib/
+
+#   debian 10
+#   note: EC_MASTER LIB does not depend on epics version hence use the 7.0.8 build..
+USR_LDFLAGS_deb10-x86_64 += -lethercat
+EC_MASTER_LIB = /ioc/NeedfulThings/EtherCAT/4epics/v1.1.0/R7.0.8/
+USR_LDFLAGS_deb10-x86_64 += -Wl,-rpath=${EC_MASTER_LIB}lib/${T_A}
+USR_LDFLAGS_deb10-x86_64 +=  -L ${EC_MASTER_LIB}lib/${T_A}
+USR_CXXFLAGS_deb10-x86_64 += -I${EC_MASTER_LIB}/include/
+
 BASE_DIR = .
 SRC_DIR = $(BASE_DIR)/src
 DB_DIR =  $(BASE_DIR)/Db