From ab5231f2f65f2bd4f7e3230eb4b2b8604fca1f21 Mon Sep 17 00:00:00 2001
From: Marcello Stanisci <stanisci.m@gmail.com>
Date: Thu, 28 Mar 2019 19:56:32 +0100
Subject: Care about the --system pip's flag.

---
 Makefile.in  |  4 ++--
 configure.ac | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index e54f1e1..3748959 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -55,9 +55,9 @@ compile-lang:
 # install into prefix
 .PHONY: install
 install: $(templates) install-data compile-lang
-	@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 talerbackoffice/backoffice/static/web-common && make install && cd -
 
 # run testcases
diff --git a/configure.ac b/configure.ac
index 2eee4c7..879c84f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,6 +31,16 @@ AC_MSG_RESULT([$VERSION])
 
 AX_COMPARE_VERSION([$VERSION],[lt],[6.0], [AC_MSG_ERROR([Please install pip3>=6.0])])
 
+# 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)
 
 #
 # Check for tsc
-- 
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