From f40114e5b56522890ffe7d9fab80dfc0fecf2ac2 Mon Sep 17 00:00:00 2001
From: Marcello Stanisci <stanisci.m@gmail.com>
Date: Wed, 27 Mar 2019 18:41:02 +0100
Subject: fix pip3 invocation

---
 Makefile.in  |  4 ++--
 configure.ac | 13 +++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index 1a7f2b0..8f5ae5b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -40,9 +40,9 @@ devinstall: $(templates) install-data
 # install into prefix
 .PHONY: install
 install: $(templates) install-data
-	@pip3 install . --install-option="--prefix=@prefix@"
+	@pip3 install . @DEBIAN_PIP3_SYSTEM@ --install-option="--prefix=@prefix@"
 	@# force update when sources changed
-	@pip3 install . --install-option="--prefix=@prefix@" --upgrade --no-deps
+	@pip3 install . @DEBIAN_PIP3_SYSTEM@ --install-option="--prefix=@prefix@" --upgrade --no-deps
 	cd talersurvey/survey/static/web-common && make install && cd -
 
 # run testcases
diff --git a/configure.ac b/configure.ac
index 58f5b5e..5e349d2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,19 @@ if test $? -ne 0;
   AC_MSG_ERROR([Please install pip3>=6.0])
 fi
 
+# On Debian systems, we may need to pass "--system" to pip3 to get
+# to the desired installation target directory
+pip3 install --help | grep '\-\-system' >> /dev/null
+if test $? -ne 0;
+then
+   DEBIAN_PIP3_SYSTEM=""
+else
+   DEBIAN_PIP3_SYSTEM="--system"
+fi
+AC_SUBST(DEBIAN_PIP3_SYSTEM)
+
+
+
 VERSION=$(pip3 --version | $AWK '{ print $2 }')
 
 AC_MSG_RESULT([$VERSION])
-- 
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