From 3b9c72df689677a814b1f1a615efdea0c03cf633 Mon Sep 17 00:00:00 2001
From: Sutou Kouhei <kou@clear-code.com>
Date: Mon, 19 Dec 2022 15:42:15 +0900
Subject: [PATCH] "pkg-config --cflags" may be empty

For example, Apache Arrow C++ is installed in system directory.
---
 r/configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/r/configure b/r/configure
index 8184080ed7b9e..2ff01d2e6353a 100755
--- a/r/configure
+++ b/r/configure
@@ -106,7 +106,7 @@ else
     PKGCONFIG_DIRS=`pkg-config --libs-only-L --silence-errors ${PKG_CONFIG_NAME}`
   fi
 
-  if [ "$PKGCONFIG_CFLAGS" ] && [ "$PKGCONFIG_LIBS" ]; then
+  if [ "$PKGCONFIG_LIBS" != "" ]; then
     FOUND_LIB_DIR=`echo $PKGCONFIG_DIRS | sed -e 's/^-L//'`
     echo "*** Arrow C++ libraries found via pkg-config at $FOUND_LIB_DIR"
     PKG_CFLAGS="$PKGCONFIG_CFLAGS $PKG_CFLAGS"