diff --git a/GNUmakefile b/GNUmakefile
index 82ca058..f91cbaf 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -19,23 +19,28 @@ OPT_CXXFLAGS_YES = -O3
 
 # dependencies
 ecmc_VERSION = 10.0
-ECmasterECMC_VERSION = v1.1.0
 
 # ethercat
-EC_BASE_PATH = /ioc/NeedfulThings/EtherCAT/4epics/
+#   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/
 
-OPT_CXXFLAGS_YES = -O3
-
 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 = ${EPICS_MODULES}/ECmasterECMC/${ECmasterECMC_VERSION}/R${EPICSVERSION}/lib/${T_A}
-USR_LDFLAGS_deb10-x86_64 += -Wl,-rpath=${EC_MASTER_LIB}
-USR_LDFLAGS_deb10-x86_64 +=         -L ${EC_MASTER_LIB}
+EC_MASTER_LIB = /ioc/NeedfulThings/EtherCAT/4epics/v1.1.0/R7.0.8/
+USR_LDFLAGS_deb10-x86_64 += -Wl,-rpath=${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/
+
+OPT_CXXFLAGS_YES = -O3
+
 
 BASE_DIR = .
 SRC_DIR = $(BASE_DIR)/src