diff --git a/DESCRIPTION b/DESCRIPTION
index 430cecb..6eb8865 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: fCWTr
 Type: Package
 Title: Fast Continuous Wavelet Transform
-Version: 0.2.9000
+Version: 0.3.0
 Authors@R: c(
     person("Lukas", "Schneiderbauer",
         email = "lukas.schneiderbauer@gmail.com",
@@ -33,7 +33,7 @@ Suggests:
 LinkingTo: 
     cpp11
 SystemRequirements:
-    fftw3 (including single precision support fftw3f), fftw3f_omp (optional), OpenMP (optional)
+    fftw3 (including single precision support fftw3f; 'fftw-s' macOS recipe), fftw3f_omp (optional), OpenMP (optional)
 Config/testthat/edition: 3
 URL: https://lschneiderbauer.github.io/fCWTr/, https://github.com/lschneiderbauer/fCWTr
 Roxygen: list(markdown = TRUE)
diff --git a/NEWS.md b/NEWS.md
index 49aad3a..0254748 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# fCWTr 0.2.9000
+# fCWTr 0.3.0
 
 -   `fcwt():`
 
diff --git a/configure b/configure
index 2264d83..9985f2d 100755
--- a/configure
+++ b/configure
@@ -647,7 +647,7 @@ OPENMP_CXXFLAGS
 ac_ct_CXX
 CXXFLAGS
 CXX
-BREW
+PKG_CONFIG
 CPP
 OBJEXT
 EXEEXT
@@ -1544,41 +1544,6 @@ fi
 
 } # ac_fn_cxx_try_compile
 
-# ac_fn_cxx_check_header_compile LINENO HEADER VAR INCLUDES
-# ---------------------------------------------------------
-# Tests whether HEADER exists and can be compiled using the include files in
-# INCLUDES, setting the cache variable VAR accordingly.
-ac_fn_cxx_check_header_compile ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
-printf %s "checking for $2... " >&6; }
-if eval test \${$3+y}
-then :
-  printf %s "(cached) " >&6
-else case e in #(
-  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-$4
-#include <$2>
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"
-then :
-  eval "$3=yes"
-else case e in #(
-  e) eval "$3=no" ;;
-esac
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
-esac
-fi
-eval ac_res=\$$3
-	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-printf "%s\n" "$ac_res" >&6; }
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-
-} # ac_fn_cxx_check_header_compile
-
 # ac_fn_cxx_try_link LINENO
 # -------------------------
 # Try to link conftest.$ac_ext, and return whether this succeeded.
@@ -1626,6 +1591,41 @@ fi
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_link
+
+# ac_fn_cxx_check_header_compile LINENO HEADER VAR INCLUDES
+# ---------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_cxx_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+printf %s "checking for $2... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"
+then :
+  eval "$3=yes"
+else case e in #(
+  e) eval "$3=no" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_cxx_check_header_compile
 ac_configure_args_raw=
 for ac_arg
 do
@@ -2542,7 +2542,6 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-
 # Find the compiler and compiler flags used by R.
 : ${R_HOME=`R RHOME`}
 if test -z "${R_HOME}"; then
@@ -3722,22 +3721,20 @@ ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
-
-
-
-# extra check for macos brew
-# Extract the first word of "brew", so it can be a program name with args.
-set dummy brew; ac_word=$2
+# Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 printf %s "checking for $ac_word... " >&6; }
-if test ${ac_cv_prog_BREW+y}
+if test ${ac_cv_path_PKG_CONFIG+y}
 then :
   printf %s "(cached) " >&6
 else case e in #(
-  e) if test -n "$BREW"; then
-  ac_cv_prog_BREW="$BREW" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+  e) case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
 do
   IFS=$as_save_IFS
@@ -3748,7 +3745,7 @@ do
   esac
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
-    ac_cv_prog_BREW="yes"
+    ac_cv_path_PKG_CONFIG="$as_dir$ac_word$ac_exec_ext"
     printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -3756,32 +3753,25 @@ done
   done
 IFS=$as_save_IFS
 
-fi ;;
+  ;;
+esac ;;
 esac
 fi
-BREW=$ac_cv_prog_BREW
-if test -n "$BREW"; then
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $BREW" >&5
-printf "%s\n" "$BREW" >&6; }
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+if test -n "$PKG_CONFIG"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $PKG_CONFIG" >&5
+printf "%s\n" "$PKG_CONFIG" >&6; }
 else
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
 fi
 
 
-if test "x${BREW}" = xyes; then
-  # in order for AC_CHECK_HEADER to work
-  CPPFLAGS="${CPPFLAGS} -I`brew --prefix`/include"
-  PKG_CPPFLAGS="-I`brew --prefix`/include"
-
-  LDFLAGS="${LDFLAGS} -L`brew --prefix`/lib"
-  PKG_LDFLAGS="-L`brew --prefix`/lib"
+if test -e penmp || test -e mp; then
+  as_fn_error $? "AC_OPENMP clobbers files named 'mp' and 'penmp'. Aborting configure because one of these files already exists." "$LINENO" 5
 fi
 
 
-# Check for fftw3.h header
-
-
 
 
 
@@ -4169,6 +4159,117 @@ ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ex
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
+# Check whether --enable-openmp was given.
+if test ${enable_openmp+y}
+then :
+  enableval=$enable_openmp;
+fi
+
+  OPENMP_CXXFLAGS=
+  if test "$enable_openmp" != no; then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to support OpenMP" >&5
+printf %s "checking for $CXX option to support OpenMP... " >&6; }
+if test ${ac_cv_prog_cxx_openmp+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_cv_prog_cxx_openmp='not found'
+                                                                        for ac_option in '' -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp -homp \
+                       -Popenmp --openmp; do
+
+        ac_save_CXXFLAGS=$CXXFLAGS
+        CXXFLAGS="$CXXFLAGS $ac_option"
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifndef _OPENMP
+#error "OpenMP not supported"
+#endif
+#include <omp.h>
+int main (void) { return omp_get_num_threads (); }
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"
+then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifndef _OPENMP
+#error "OpenMP not supported"
+#endif
+#include <omp.h>
+int main (void) { return omp_get_num_threads (); }
+
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"
+then :
+  ac_cv_prog_cxx_openmp=$ac_option
+else case e in #(
+  e) ac_cv_prog_cxx_openmp='unsupported' ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+        CXXFLAGS=$ac_save_CXXFLAGS
+
+        if test "$ac_cv_prog_cxx_openmp" != 'not found'; then
+          break
+        fi
+      done
+      if test "$ac_cv_prog_cxx_openmp" = 'not found'; then
+        ac_cv_prog_cxx_openmp='unsupported'
+      elif test "$ac_cv_prog_cxx_openmp" = ''; then
+        ac_cv_prog_cxx_openmp='none needed'
+      fi
+                        rm -f penmp mp ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_openmp" >&5
+printf "%s\n" "$ac_cv_prog_cxx_openmp" >&6; }
+    if test "$ac_cv_prog_cxx_openmp" != 'unsupported' && \
+       test "$ac_cv_prog_cxx_openmp" != 'none needed'; then
+      OPENMP_CXXFLAGS="$ac_cv_prog_cxx_openmp"
+    fi
+  fi
+
+
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for pkg-config" >&5
+printf %s "checking for pkg-config... " >&6; }
+
+if "$PKG_CONFIG" --version
+then :
+
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+  as_fn_error $? "Provided flags don't work and pkg-config is not present." "$LINENO" 5 ;;
+esac
+fi
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether pkg-config knows about fftw3f" >&5
+printf %s "checking whether pkg-config knows about fftw3f... " >&6; }
+
+if $PKG_CONFIG fftw3f
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+     as_fn_error $? "Install libfftw3-dev or equivalent first" "$LINENO" 5 ;;
+esac
+fi
+
+CPPFLAGS="${CPPFLAGS} `$PKG_CONFIG --cflags fftw3f`"
+LIBS="${LIBS} `$PKG_CONFIG --libs fftw3f`"
+
+# needs to be after pkg-config checks
+# to have correct paths already
+
+# Check for fftw3.h header
 ac_header= ac_cache=
 for ac_item in $ac_header_cxx_list
 do
@@ -4214,92 +4315,9 @@ esac
 fi
 
 
-have_fftw=no
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for library containing fftwf_free" >&5
-printf %s "checking for library containing fftwf_free... " >&6; }
-if test ${ac_cv_search_fftwf_free+y}
-then :
-  printf %s "(cached) " >&6
-else case e in #(
-  e) ac_func_search_save_LIBS=$LIBS
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-namespace conftest {
-  extern "C" int fftwf_free ();
-}
-int
-main (void)
-{
-return conftest::fftwf_free ();
-  ;
-  return 0;
-}
-_ACEOF
-for ac_lib in '' fftw3f
-do
-  if test -z "$ac_lib"; then
-    ac_res="none required"
-  else
-    ac_res=-l$ac_lib
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
-  fi
-  if ac_fn_cxx_try_link "$LINENO"
-then :
-  ac_cv_search_fftwf_free=$ac_res
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext
-  if test ${ac_cv_search_fftwf_free+y}
-then :
-  break
-fi
-done
-if test ${ac_cv_search_fftwf_free+y}
-then :
-
-else case e in #(
-  e) ac_cv_search_fftwf_free=no ;;
-esac
-fi
-rm conftest.$ac_ext
-LIBS=$ac_func_search_save_LIBS ;;
-esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_fftwf_free" >&5
-printf "%s\n" "$ac_cv_search_fftwf_free" >&6; }
-ac_res=$ac_cv_search_fftwf_free
-if test "$ac_res" != no
-then :
-  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
-  have_fftw=yes
-else case e in #(
-  e) as_fn_error $? "The fftw3 library with single precision support is required. In case fftw is already installed, you might need to enable fftw's single precision support with './configure --enable-type-prefix  --enable-float'." "$LINENO" 5
- ;;
-esac
-fi
-
-
-# Check for omp.h header
-ac_fn_cxx_check_header_compile "$LINENO" "omp.h" "ac_cv_header_omp_h" "$ac_includes_default"
-if test "x$ac_cv_header_omp_h" = xyes
-then :
-
-
-printf "%s\n" "#define HAVE_OMP_H 1" >>confdefs.h
-
-
-else case e in #(
-  e)
-
-printf "%s\n" "#define HAVE_OMP_H 0" >>confdefs.h
-
- ;;
-esac
-fi
-
-
-have_fftw_omp=no
+# there are no pkg-config files for fftw3-omp,
+# so check like this.
+# have_fftw_omp=no
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for library containing fftwf_plan_with_nthreads" >&5
 printf %s "checking for library containing fftwf_plan_with_nthreads... " >&6; }
 if test ${ac_cv_search_fftwf_plan_with_nthreads+y}
@@ -4366,94 +4384,15 @@ esac
 fi
 
 
-if test -e penmp || test -e mp; then
-  as_fn_error $? "AC_OPENMP clobbers files named 'mp' and 'penmp'. Aborting configure because one of these files already exists." "$LINENO" 5
-fi
-# Check whether --enable-openmp was given.
-if test ${enable_openmp+y}
-then :
-  enableval=$enable_openmp;
-fi
-
-  OPENMP_CXXFLAGS=
-  if test "$enable_openmp" != no; then
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to support OpenMP" >&5
-printf %s "checking for $CXX option to support OpenMP... " >&6; }
-if test ${ac_cv_prog_cxx_openmp+y}
-then :
-  printf %s "(cached) " >&6
-else case e in #(
-  e) ac_cv_prog_cxx_openmp='not found'
-                                                                        for ac_option in '' -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp -homp \
-                       -Popenmp --openmp; do
-
-        ac_save_CXXFLAGS=$CXXFLAGS
-        CXXFLAGS="$CXXFLAGS $ac_option"
-        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#ifndef _OPENMP
-#error "OpenMP not supported"
-#endif
-#include <omp.h>
-int main (void) { return omp_get_num_threads (); }
-
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"
-then :
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#ifndef _OPENMP
-#error "OpenMP not supported"
-#endif
-#include <omp.h>
-int main (void) { return omp_get_num_threads (); }
-
-_ACEOF
-if ac_fn_cxx_try_link "$LINENO"
-then :
-  ac_cv_prog_cxx_openmp=$ac_option
-else case e in #(
-  e) ac_cv_prog_cxx_openmp='unsupported' ;;
-esac
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext conftest.$ac_ext
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-        CXXFLAGS=$ac_save_CXXFLAGS
-
-        if test "$ac_cv_prog_cxx_openmp" != 'not found'; then
-          break
-        fi
-      done
-      if test "$ac_cv_prog_cxx_openmp" = 'not found'; then
-        ac_cv_prog_cxx_openmp='unsupported'
-      elif test "$ac_cv_prog_cxx_openmp" = ''; then
-        ac_cv_prog_cxx_openmp='none needed'
-      fi
-                        rm -f penmp mp ;;
-esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_openmp" >&5
-printf "%s\n" "$ac_cv_prog_cxx_openmp" >&6; }
-    if test "$ac_cv_prog_cxx_openmp" != 'unsupported' && \
-       test "$ac_cv_prog_cxx_openmp" != 'none needed'; then
-      OPENMP_CXXFLAGS="$ac_cv_prog_cxx_openmp"
-    fi
-  fi
-
-
 
 # Write the flags into the src/Makevars file.
-PKG_CPPFLAGS="${PKG_CPPFLAGS} ${FFTW_CPPFLAGS} ${FFTW_OMP_CPPFLAGS} ${OPENMP_CPPFLAGS}"
+PKG_CPPFLAGS="${CPPFLAGS} ${OPENMP_CFLAGS}"
 
-PKG_CXXFLAGS="${PKG_CXXFLAGS} ${FFTW_CXXFLAGS} ${FFTW_OMP_CXXFLAGS} ${OPENMP_CXXFLAGS}"
+PKG_CXXFLAGS="${CXXFLAGS} ${OPENMP_CXXFLAGS}"
 
-PKG_LDFLAGS="${PKG_LDFLAGS} ${OPENMP_CXXFLAGS}"
+PKG_LDFLAGS="${LDFLAGS} ${OPENMP_CXXFLAGS}"
 
-PKG_LIBS="${LIBS} ${PKG_LIBS} ${FFTW_LIBS} ${FFTW_OMP_LIBS}"
+PKG_LIBS="${LIBS}"
 
 ac_config_files="$ac_config_files src/Makevars"
 
diff --git a/configure.ac b/configure.ac
index 6384961..517dfe4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,6 @@
 AC_INIT([fCWTr],[0.2.9000])
 
 
-
 # Find the compiler and compiler flags used by R.
 : ${R_HOME=`R RHOME`}
 if test -z "${R_HOME}"; then
@@ -14,20 +13,24 @@ CPPFLAGS="`"${R_HOME}/bin/R" CMD config CPPFLAGS`"
 LDFLAGS="`"${R_HOME}/bin/R" CMD config LDFLAGS`"
 AC_LANG(C++)
 AC_PROG_CPP
+AC_PATH_PROG([PKG_CONFIG], [pkg-config])
+AC_OPENMP
 
+AC_MSG_CHECKING([for pkg-config])
 
+AS_IF(["$PKG_CONFIG" --version], , [AC_MSG_RESULT([no])
+  AC_MSG_ERROR([Provided flags don't work and pkg-config is not present.])])
 
-# extra check for macos brew
-AC_CHECK_PROG(BREW,brew,yes)
-if test "x${BREW}" = xyes; then
-  # in order for AC_CHECK_HEADER to work
-  CPPFLAGS="${CPPFLAGS} -I`brew --prefix`/include"
-  PKG_CPPFLAGS="-I`brew --prefix`/include"
+AC_MSG_CHECKING([whether pkg-config knows about fftw3f])
 
-  LDFLAGS="${LDFLAGS} -L`brew --prefix`/lib"
-  PKG_LDFLAGS="-L`brew --prefix`/lib"
-fi
+AS_IF([$PKG_CONFIG fftw3f], [AC_MSG_RESULT(yes)], [AC_MSG_RESULT([no])
+     AC_MSG_ERROR([Install libfftw3-dev or equivalent first])])
 
+CPPFLAGS="${CPPFLAGS} `$PKG_CONFIG --cflags fftw3f`"
+LIBS="${LIBS} `$PKG_CONFIG --libs fftw3f`"
+
+# needs to be after pkg-config checks
+# to have correct paths already
 
 # Check for fftw3.h header
 AC_CHECK_HEADER([fftw3.h], [
@@ -36,36 +39,22 @@ AC_CHECK_HEADER([fftw3.h], [
   AC_MSG_ERROR([fftw3.h header file not found in: $CPPFLAGS])
 ])
 
-have_fftw=no
+# there are no pkg-config files for fftw3-omp,
+# so check like this.
+# have_fftw_omp=no
 AC_SEARCH_LIBS(
-  fftwf_free,
-  fftw3f,
-  [have_fftw=yes],
-  [AC_MSG_ERROR([The fftw3 library with single precision support is required. In case fftw is already installed, you might need to enable fftw's single precision support with './configure --enable-type-prefix  --enable-float'.])]
+ fftwf_plan_with_nthreads,
+ fftw3f_omp,
+ [have_fftw_omp=yes],
+ [AC_MSG_RESULT([The fftw3-omp support not found.])]
 )
 
-# Check for omp.h header
-AC_CHECK_HEADER([omp.h], [
-  AC_DEFINE([HAVE_OMP_H], [1], [Define if you have the omp.h header file])
-], [
-  AC_DEFINE([HAVE_OMP_H], [0], [Define if you have the omp.h header file])
-])
-
-have_fftw_omp=no
-AC_SEARCH_LIBS(
-  fftwf_plan_with_nthreads,
-  fftw3f_omp,
-  [have_fftw_omp=yes],
-  [AC_MSG_RESULT([The fftw3-omp support not found.])]
-)
-
-AC_OPENMP
 
 # Write the flags into the src/Makevars file.
-AC_SUBST([PKG_CPPFLAGS], ["${PKG_CPPFLAGS} ${FFTW_CPPFLAGS} ${FFTW_OMP_CPPFLAGS} ${OPENMP_CPPFLAGS}"])
-AC_SUBST([PKG_CXXFLAGS], ["${PKG_CXXFLAGS} ${FFTW_CXXFLAGS} ${FFTW_OMP_CXXFLAGS} ${OPENMP_CXXFLAGS}"])
-AC_SUBST([PKG_LDFLAGS], ["${PKG_LDFLAGS} ${OPENMP_CXXFLAGS}"])
-AC_SUBST([PKG_LIBS], ["${LIBS} ${PKG_LIBS} ${FFTW_LIBS} ${FFTW_OMP_LIBS}"])
+AC_SUBST([PKG_CPPFLAGS], ["${CPPFLAGS} ${OPENMP_CFLAGS}"])
+AC_SUBST([PKG_CXXFLAGS], ["${CXXFLAGS} ${OPENMP_CXXFLAGS}"])
+AC_SUBST([PKG_LDFLAGS], ["${LDFLAGS} ${OPENMP_CXXFLAGS}"])
+AC_SUBST([PKG_LIBS], ["${LIBS}"])
 AC_CONFIG_FILES([src/Makevars])
 AC_OUTPUT