From 0bed621d0c373107dca3ff97ce3b81f29bb35a64 Mon Sep 17 00:00:00 2001
From: iarspider <iarspider@gmail.com>
Date: Wed, 8 Jul 2020 17:50:47 +0200
Subject: Add missing file (#17426)

Co-authored-by: Ivan Razumov <ivan.razumov@cern.ch>
---
 var/spack/repos/builtin/packages/rivet/gsl.m4 | 60 +++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 var/spack/repos/builtin/packages/rivet/gsl.m4

diff --git a/var/spack/repos/builtin/packages/rivet/gsl.m4 b/var/spack/repos/builtin/packages/rivet/gsl.m4
new file mode 100644
index 0000000000..61c89c957c
--- /dev/null
+++ b/var/spack/repos/builtin/packages/rivet/gsl.m4
@@ -0,0 +1,60 @@
+# AC_SEARCH_GSL(actionIfFound, actionIfNotFound)
+AC_DEFUN([AC_SEARCH_GSL],[
+  AC_ARG_WITH([gsl], AC_HELP_STRING(--with-gsl, [path to GSL library and header files]))
+
+  ## Use a specified --with-gsl arg to set basic paths, if provided
+  GSLCONFIG_PATH=$PATH
+  if test -e "$with_gsl"; then
+    GSLCONFIG_PATH="$with_gsl/bin:$GSLCONFIG_PATH"
+    GSLPATH="$with_gsl"
+    GSLINCPATH="$GSLPATH/include"
+    GSLLIBPATH="$GSLPATH/lib"
+    GSL_CPPFLAGS="-I$GSLINCPATH"
+    GSL_CXXFLAGS=""
+    GSL_LDFLAGS="-L$GSLPATH/lib -lgsl -lgslcblas -lm"
+  fi
+
+  ## Try to do better, using the gsl-config script
+  AC_PATH_PROG(GSLCONFIG, gsl-config, [], [$GSLCONFIG_PATH])
+  if test -x "$GSLCONFIG"; then
+    AC_MSG_NOTICE(Using $GSLCONFIG to find GSL flags)
+    GSLPATH=`$GSLCONFIG --prefix`
+    GSLINCPATH="$GSLPATH/include"
+    GSLLIBPATH="$GSLPATH/lib"
+    GSL_CPPFLAGS=`$GSLCONFIG --cflags`
+    GSL_CXXFLAGS=`$GSLCONFIG --cflags`
+    GSL_LDFLAGS=`$GSLCONFIG --libs`
+  fi
+
+  ## If it's worked, propagate the conditionals and execute success arg
+  if test -e "$GSLPATH"; then
+    AM_CONDITIONAL([WITH_GSL], true)
+    AM_CONDITIONAL([WITH_GSLLIB], true)
+    AM_CONDITIONAL([WITH_GSLINC], true)
+    AM_CONDITIONAL([WITHOUT_GSL], false)
+    AM_CONDITIONAL([WITHOUT_GSLLIB], false)
+    AM_CONDITIONAL([WITHOUT_GSLINC], false)
+    $1
+  else
+    ## Otherwise execute the fail arg
+    AM_CONDITIONAL([WITH_GSL], false)
+    AM_CONDITIONAL([WITH_GSLLIB], false)
+    AM_CONDITIONAL([WITH_GSLINC], false)
+    AM_CONDITIONAL([WITHOUT_GSL], true)
+    AM_CONDITIONAL([WITHOUT_GSLLIB], true)
+    AM_CONDITIONAL([WITHOUT_GSLINC], true)
+    $2
+  fi
+
+  ## Propagate path and flag variables
+  AC_SUBST([GSLPATH])
+  AC_SUBST([GSLINCPATH])
+  AC_SUBST([GSLLIBPATH])
+  AC_SUBST([GSL_CPPFLAGS])
+  AC_SUBST([GSL_CXXFLAGS])
+  AC_SUBST([GSL_LDFLAGS])
+  AC_MSG_NOTICE([GSL include path is $GSLINCPATH])
+  AC_MSG_NOTICE([GSL CPPFLAGS is $GSL_CPPFLAGS])
+  AC_MSG_NOTICE([GSL CXXFLAGS is $GSL_CXXFLAGS])
+  AC_MSG_NOTICE([GSL LDFLAGS is $GSL_LDFLAGS])
+])
-- 
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