diff --git a/f4pga/platforms/ql-eos-s3.json b/f4pga/platforms/ql-eos-s3.json
index 78deaf1..f55f5b4 100644
--- a/f4pga/platforms/ql-eos-s3.json
+++ b/f4pga/platforms/ql-eos-s3.json
@@ -464,7 +464,6 @@
                     "$F4PGA_INSTALL_DIR": "${shareDir}/../../../../",
                     "$FPGA_FAM": "eos-s3",
                     "$PATH": "${shareDir}/../../../conda/envs/eos-s3/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
-                    "$SHARE_DIR_PATH": "${shareDir}",
                     "$BIN_DIR_PATH": "${binDir}"
                 }
             }
diff --git a/f4pga/wrappers/sh/__init__.py b/f4pga/wrappers/sh/__init__.py
index 1642806..e80ea51 100644
--- a/f4pga/wrappers/sh/__init__.py
+++ b/f4pga/wrappers/sh/__init__.py
@@ -70,7 +70,7 @@ def p_vpr_common_cmds(log_suffix = None):
     return f"""
 set -e
 source {ROOT / SH_SUBDIR}/vpr_common.f4pga.sh
-parse_args {' '.join(sys_argv[1:])}
+parse_args {' '.join([f"'{arg}'" for arg in sys_argv[1:]])}
 """ + (f"""
 export OUT_NOISY_WARNINGS=noisy_warnings-${{DEVICE}}_{log_suffix}.log
 """ if log_suffix is not None else '')
@@ -112,6 +112,8 @@ def p_vpr_run():
         raise(Exception('[F4PGA] vpr run: envvar PLACE_DELAY cannot be unset/empty!'))
 
     sdc = f4pga_environ.get('SDC')
+    if sdc == '':
+        sdc = None
 
     check_call(
         [
diff --git a/f4pga/wrappers/sh/quicklogic/ql.f4pga.sh b/f4pga/wrappers/sh/quicklogic/ql.f4pga.sh
index b453032..e7c8d30 100755
--- a/f4pga/wrappers/sh/quicklogic/ql.f4pga.sh
+++ b/f4pga/wrappers/sh/quicklogic/ql.f4pga.sh
@@ -18,8 +18,6 @@
 
 set -e
 
-SHARE_DIR_PATH=${SHARE_DIR_PATH:-"$F4PGA_SHARE_DIR"}
-
 source $(dirname "$0")/vpr_common.f4pga.sh
 
 VERSION="v2.0.1"
@@ -196,10 +194,8 @@ if [[ $1 == "-compile" || $1 == "-post_verilog" ]]; then
   fi
 fi
 
-if [ ! -z "$SOURCE" ]; then
-  if [ ! -d $SOURCE/$BUILDDIR ]; then
-    mkdir -p $SOURCE/$BUILDDIR
-  fi
+if [ ! -z "$SOURCE" ] && [ ! -d $SOURCE/$BUILDDIR ]; then
+  mkdir -p $SOURCE/$BUILDDIR
 fi
 
 if [ ! -z "$OUT" ]; then
@@ -302,7 +298,7 @@ else
   PCF_MAKE="\${current_dir}/${BUILDDIR}/${TOP}_dummy.pcf"
 fi
 
-PROCESS_SDC=$(realpath "$F4PGA_SHARE_DIR"/scripts/process_sdc_constraints.py)
+PROCESS_SDC="$F4PGA_SHARE_DIR"/scripts/process_sdc_constraints.py
 if ! [ -z "$SDC" ]; then
   if ! [ -f "$SOURCE"/$SDC ];then
     echo "The sdc file: $SDC is missing at: $SOURCE"
diff --git a/f4pga/wrappers/sh/quicklogic/synth.f4pga.sh b/f4pga/wrappers/sh/quicklogic/synth.f4pga.sh
index 1d19fd8..575ac32 100755
--- a/f4pga/wrappers/sh/quicklogic/synth.f4pga.sh
+++ b/f4pga/wrappers/sh/quicklogic/synth.f4pga.sh
@@ -18,9 +18,8 @@
 
 set -e
 
-export SHARE_DIR_PATH=${SHARE_DIR_PATH:-"$F4PGA_SHARE_DIR"}
-SPLIT_INOUTS=`realpath ${SHARE_DIR_PATH}/scripts/split_inouts.py`
-CONVERT_OPTS=`realpath ${SHARE_DIR_PATH}/scripts/convert_compile_opts.py`
+SPLIT_INOUTS="${F4PGA_SHARE_DIR}"/scripts/split_inouts.py
+CONVERT_OPTS="${F4PGA_SHARE_DIR}"/scripts/convert_compile_opts.py
 
 print_usage () {
     echo "Usage: symbiflow_synth  -v|--verilog <Verilog file list>"
@@ -122,10 +121,10 @@ fi
 
 PINMAPCSV="pinmap_${PART}.csv"
 
-export TECHMAP_PATH="${SHARE_DIR_PATH}/techmaps/${FAMILY}"
+export TECHMAP_PATH="${F4PGA_SHARE_DIR}/techmaps/${FAMILY}"
 
-SYNTH_TCL_PATH="${SHARE_DIR_PATH}/scripts/${FAMILY}/synth.tcl"
-CONV_TCL_PATH="${SHARE_DIR_PATH}/scripts/${FAMILY}/conv.tcl"
+SYNTH_TCL_PATH="${F4PGA_SHARE_DIR}/scripts/${FAMILY}/synth.tcl"
+CONV_TCL_PATH="${F4PGA_SHARE_DIR}/scripts/${FAMILY}/conv.tcl"
 
 export USE_ROI="FALSE"
 export OUT_JSON=$TOP.json
@@ -134,7 +133,7 @@ export OUT_SYNTH_V=${TOP}_synth.v
 export OUT_EBLIF=${TOP}.eblif
 export OUT_FASM_EXTRA=${TOP}_fasm_extra.fasm
 export PYTHON3=$(which python3)
-export UTILS_PATH=${SHARE_DIR_PATH}/scripts
+export UTILS_PATH="${F4PGA_SHARE_DIR}"/scripts
 
 if [ -s $PCF ]; then
     export PCF_FILE=$PCF
@@ -142,7 +141,7 @@ else
     export PCF_FILE=""
 fi
 
-DEVICE_PATH="${SHARE_DIR_PATH}/arch/${DEVICE}_${DEVICE}"
+DEVICE_PATH="${F4PGA_SHARE_DIR}/arch/${DEVICE}_${DEVICE}"
 export PINMAP_FILE=${DEVICE_PATH}/${PINMAPCSV}
 if [ -d "${DEVICE_PATH}/cells" ]; then
   export DEVICE_CELLS_SIM=`find ${DEVICE_PATH}/cells -name "*_sim.v"`
@@ -151,7 +150,7 @@ else
   # pp3 family has different directory naming scheme
   # the are named as ${DEVICE}_${PACKAGE}
   # ${PACKAGE} is not known because it is not passed down in add_binary_toolchain_test
-  DEVICE_PATH=$(find $(realpath ${SHARE_DIR_PATH}/arch/) -type d -name "${DEVICE}*")
+  DEVICE_PATH=$(find "${F4PGA_SHARE_DIR}"/arch/ -type d -name "${DEVICE}*")
   export PINMAP_FILE=${DEVICE_PATH}/${PINMAPCSV}
   if [ -d "${DEVICE_PATH}/cells" ]; then
     export DEVICE_CELLS_SIM=`find ${DEVICE_PATH}/cells -name "*_sim.v"`
diff --git a/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh b/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
index 4c0a59a..7b792a6 100755
--- a/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
+++ b/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
@@ -16,8 +16,6 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-SHARE_DIR_PATH=${SHARE_DIR_PATH:-"$F4PGA_SHARE_DIR"}
-
 if [ -z $VPR_OPTIONS ]; then
   echo "Using default VPR options."
   VPR_OPTIONS="
@@ -118,7 +116,7 @@ function parse_args {
   fi
 
   DEVICE_ARCH="${DEVICE_1}_${DEVICE_2}"
-  export ARCH_DIR=`realpath ${SHARE_DIR_PATH}/arch/${DEVICE_ARCH}`
+  export ARCH_DIR="${F4PGA_SHARE_DIR}/arch/${DEVICE_ARCH}"
   export ARCH_DEF="${ARCH_DIR}/arch_${DEVICE_ARCH}".xml
   ARCH_RR_PREFIX="${ARCH_DIR}/rr_graph_${DEVICE_ARCH}"
   # qlf* devices use different naming scheme than pp3* ones.
diff --git a/f4pga/wrappers/sh/xc7/synth.f4pga.sh b/f4pga/wrappers/sh/xc7/synth.f4pga.sh
index 37a5440..c1e87b8 100755
--- a/f4pga/wrappers/sh/xc7/synth.f4pga.sh
+++ b/f4pga/wrappers/sh/xc7/synth.f4pga.sh
@@ -18,10 +18,9 @@
 
 set -e
 
-export SHARE_DIR_PATH="$F4PGA_SHARE_DIR"
-export TECHMAP_PATH=${SHARE_DIR_PATH}/techmaps/xc7_vpr/techmap
+export TECHMAP_PATH="${F4PGA_SHARE_DIR}"/techmaps/xc7_vpr/techmap
 
-export UTILS_PATH=${SHARE_DIR_PATH}/scripts
+export UTILS_PATH="${F4PGA_SHARE_DIR}"/scripts
 SYNTH_TCL_PATH=${UTILS_PATH}/xc7/synth.tcl
 
 VERILOG_FILES=()
diff --git a/f4pga/wrappers/sh/xc7/vpr_common.f4pga.sh b/f4pga/wrappers/sh/xc7/vpr_common.f4pga.sh
index fa81a13..3646ed1 100755
--- a/f4pga/wrappers/sh/xc7/vpr_common.f4pga.sh
+++ b/f4pga/wrappers/sh/xc7/vpr_common.f4pga.sh
@@ -16,9 +16,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-SHARE_DIR_PATH=${SHARE_DIR_PATH:-"$F4PGA_SHARE_DIR"}
-
-if [ -z $VPR_OPTIONS ]; then
+if [ -z "$VPR_OPTIONS" ]; then
   echo "Using default VPR options."
   VPR_OPTIONS="
     --max_router_iterations 500
@@ -76,13 +74,13 @@ function parse_args {
      esac
    done
 
-  if [ -z $DEVICE ] && [ -n $PART ]; then
+  if [ -z "$DEVICE" ] && [ -n "$PART" ]; then
     # Try to find device name. Accept only when exactly one is found
-    PART_DIRS=(${SHARE_DIR_PATH}/arch/*/${PART})
+    PART_DIRS=(${F4PGA_SHARE_DIR}/arch/*/${PART})
     if [ ${#PART_DIRS[@]} -eq 1 ]; then DEVICE=$(basename $(dirname "${PART_DIRS[0]}")); fi
   fi
-  if [ -z $DEVICE ]; then echo "Please provide device name"; exit 1; fi
-  if [ -z $EBLIF ]; then echo "Please provide blif file name"; exit 1; fi
+  if [ -z "$DEVICE" ]; then echo "Please provide device name"; exit 1; fi
+  if [ -z "$EBLIF" ]; then echo "Please provide blif file name"; exit 1; fi
 
   export DEVICE="$DEVICE"
   export EBLIF="$EBLIF"
@@ -91,7 +89,7 @@ function parse_args {
   export SDC="$SDC"
   export VPR_OPTIONS="$VPR_OPTIONS $ADDITIONAL_VPR_OPTIONS"
 
-  export ARCH_DIR=`realpath ${SHARE_DIR_PATH}/arch/$DEVICE`
+  export ARCH_DIR="${F4PGA_SHARE_DIR}/arch/$DEVICE"
   export ARCH_DEF="${ARCH_DIR}"/arch.timing.xml
   ARCH_RR_PREFIX="${ARCH_DIR}/rr_graph_${DEVICE}"
   export RR_GRAPH="${ARCH_RR_PREFIX}".rr_graph.real.bin