diff --git a/Makefile b/Makefile
index f838e92d1f1a28697467382026c061a76dde9522..51dc0420e95d4c285a36cac5c1bb42b022fe28ca 100644
--- a/Makefile
+++ b/Makefile
@@ -46,9 +46,8 @@ marconi_sp: compile
 
 # For compiling on marconi in single prec.
 marconi_dbg: F90 = mpiifort
-marconi_dbg: F90FLAGS = -g -traceback -ftrapuv -warn all -debug all
-marconi_dbg: F90FLAGS = -DSINGLE_PRECISION -O3 -xHOST
-marconi_dbg: EXEC = $(BINDIR)/gyacomo23_sp
+marconi_dbg: F90FLAGS = -DSINGLE_PRECISION -g -traceback -ftrapuv -warn all -debug all
+marconi_dbg: EXEC = $(BINDIR)/gyacomo23_dbg
 marconi_dbg: dirs src/srcinfo.h
 marconi_dbg: compile
 
diff --git a/local/dirs.inc b/local/dirs.inc
index 09d556ede685e0b3712736e6f4f3bb8cc69e330a..f11d59fb6519ddaeb1273b59a65af51797fe81a8 100644
--- a/local/dirs.inc
+++ b/local/dirs.inc
@@ -11,8 +11,9 @@ FUTILS_DIR = $(HOME)/lib/futils/src
 # For local install :
 HDF5_LIB   = /usr/local/hdf5-1.8.22/lib
 FFTW3DIR   = $(HOME)/lib/fftw-3.3.10
-# For marconi:
-#  -comment HDF5_LIB and FFTW3DIR
-#  -uncomment the following lines
-#FFTW3DIR   = $(FFTW_HOME)#for Marconi
-#LAPACKDIR  = $(HOME)/lib/lapack-3.10.0
\ No newline at end of file
+LAPACKDIR  = $(HOME)/lib/lapack-3.10.0
+# For marconi (use of modules):
+#  -comment HDF5_LIB, FFTW3DIR and LAPACKDIR
+#  -uncomment the following lines if the module are loaded
+#FFTW3DIR   = $(FFTW_HOME)#mandatory
+#LAPACKDIR  = $(LAPACK_HOME)#optional
\ No newline at end of file