diff --git a/configure b/configure
index 99bdf57..66d939a 100755
--- a/configure
+++ b/configure
@@ -26,8 +26,8 @@ CLI_ARGS=$1
 ################################
 
 # Requirement arguments passed to pip and used by default or with --dev.
-REQUIREMENTS="--editable ."
-DEV_REQUIREMENTS="--editable .[testing]"
+REQUIREMENTS="--editable . --constraint requirements.txt"
+DEV_REQUIREMENTS="--editable .[testing] --constraint requirements.txt --constraint requirements-dev.txt"
 
 # where we create a virtualenv
 VIRTUALENV_DIR=tmp
@@ -50,8 +50,12 @@ VIRTUALENV_PYZ_URL=https://bootstrap.pypa.io/virtualenv.pyz
 CFG_ROOT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 CFG_BIN_DIR=$CFG_ROOT_DIR/$VIRTUALENV_DIR/bin
 
-# Find packages from the local thirdparty directory or from pypi
-PIP_EXTRA_ARGS="--find-links $CFG_ROOT_DIR/thirdparty"
+# Find packages from the local thirdparty directory or from thirdparty.aboutcode.org
+PIP_EXTRA_ARGS="--find-links $CFG_ROOT_DIR/thirdparty --find-links https://thirdparty.aboutcode.org/pypi"
+
+if [[ -f "$CFG_ROOT_DIR/requirements.txt" ]] && [[ -f "$CFG_ROOT_DIR/requirements-dev.txt" ]]; then
+    PIP_EXTRA_ARGS+=" --no-index"
+fi
 
 ################################
 # Set the quiet flag to empty if not defined
diff --git a/configure.bat b/configure.bat
index be8f579..75cab5f 100644
--- a/configure.bat
+++ b/configure.bat
@@ -24,8 +24,8 @@
 @rem ################################
 
 @rem # Requirement arguments passed to pip and used by default or with --dev.
-set "REQUIREMENTS=--editable ."
-set "DEV_REQUIREMENTS=--editable .[testing]"
+set "REQUIREMENTS=--editable . --constraint requirements.txt"
+set "DEV_REQUIREMENTS=--editable .[testing] --constraint requirements.txt --constraint requirements-dev.txt"
 
 @rem # where we create a virtualenv
 set "VIRTUALENV_DIR=tmp"
@@ -49,7 +49,12 @@ set "CFG_BIN_DIR=%CFG_ROOT_DIR%\%VIRTUALENV_DIR%\Scripts"
 
 @rem ################################
 @rem # Thirdparty package locations and index handling
-set "PIP_EXTRA_ARGS=--find-links %CFG_ROOT_DIR%\thirdparty"
+if exist ""%CFG_ROOT_DIR%\requirements.txt"" if exist ""%CFG_ROOT_DIR%\requirements-dev.txt"" (
+    set "INDEX_ARG= --no-index"
+) else (
+    set "INDEX_ARG= "
+)
+set "PIP_EXTRA_ARGS=--find-links %CFG_ROOT_DIR%\thirdparty --find-links https://thirdparty.aboutcode.org/pypi" & %INDEX_ARG%
 @rem ################################