diff --git a/README.md b/README.md
index c526224..c9f64e4 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
+NOTICE
+======
+
+Active development of this package has stopped. The package will receive bug fixes
+if necessary, but otherwise the code has been integrated into the `ducc0`
+package (https://gitlab.mpcdf.mpg.de/mtr/ducc), and further development is
+taking place there.
+
+Please prefer `ducc0` over `libsharp2` if you are starting a new project!
+
 # Libsharp2
 
 Library for efficient spherical harmonic transforms at arbitrary spins,
diff --git a/configure.ac b/configure.ac
index 3b40dc2..9503fc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([libsharp2], [1.0.0])
+AC_INIT([libsharp2],[1.0.0])
 AM_INIT_AUTOMAKE([foreign subdir-objects -Wall -Werror])
 AM_MAINTAINER_MODE([enable])
 
@@ -20,13 +20,13 @@ dnl
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 
-AC_PROG_CC_C99
+m4_version_prereq(2.70, [AC_PROG_CC], [AC_PROG_CC_C99])
 AC_OPENMP
 
 # add math library
 LIBS="-lm"
 
-AC_PROG_LIBTOOL
+LT_INIT
 
 tmpval=`echo $CFLAGS | grep -c '\-DMULTIARCH'`
 AM_CONDITIONAL([HAVE_MULTIARCH], [test $tmpval -gt 0])
diff --git a/test/sharp2_testsuite.c b/test/sharp2_testsuite.c
index 0e3302a..46390a4 100644
--- a/test/sharp2_testsuite.c
+++ b/test/sharp2_testsuite.c
@@ -520,7 +520,7 @@ static void do_sht (sharp_geom_info *ginfo, sharp_alm_info *ainfo,
     {
 #ifdef USE_MPI
     sharp_execute_mpi(MPI_COMM_WORLD,SHARP_MAP2ALM,spin,&alm[itrans*ncomp],&map[itrans*ncomp],ginfo,
-      ainfo,SHARP_DP|SHARP_ADD,&ttm2a,op_&tom2a);
+      ainfo,SHARP_DP|SHARP_ADD,&ttm2a,&tom2a);
 #else
     sharp_execute(SHARP_MAP2ALM,spin,&alm[itrans*ncomp],&map[itrans*ncomp],ginfo,ainfo,
       SHARP_DP|SHARP_ADD,&ttm2a,&tom2a);