diff --git a/ardour5-missing-kissfft.patch b/ardour5-missing-kissfft.patch
new file mode 100644
index 0000000..82acc34
--- /dev/null
+++ b/ardour5-missing-kissfft.patch
@@ -0,0 +1,28 @@
+diff --git a/libs/qm-dsp/wscript b/libs/qm-dsp/wscript
+index 92dc9502b..f70202379 100644
+--- a/libs/qm-dsp/wscript
++++ b/libs/qm-dsp/wscript
+@@ -26,6 +26,8 @@ def configure(conf):
+     if conf.is_defined('USE_EXTERNAL_LIBS'):
+         conf.check_cxx(header_name="base/Pitch.h", mandatory=True)
+         conf.check_cxx(lib="qm-dsp", uselib_store="QMDSP", mandatory=True)
++        conf.check_cxx(lib="kiss_fft_double", uselib_store="KISSFFT", mandatory=True)
++        conf.check_cxx(lib="kiss_fftr_double", uselib_store="KISSFFTR", mandatory=True)
+     else:
+         conf.load('compiler_cxx')
+         autowaf.configure(conf)
+diff --git a/libs/vamp-plugins/wscript b/libs/vamp-plugins/wscript
+index f3e0024ee..2acaa4959 100644
+--- a/libs/vamp-plugins/wscript
++++ b/libs/vamp-plugins/wscript
+@@ -57,8 +57,8 @@ def build(bld):
+     obj.includes     = ['.']
+     obj.name         = 'libardourvampplugins'
+     obj.target       = 'ardourvampplugins'
+-    obj.uselib       = 'FFTW3F VAMPSDK QMDSP'
+-    obj.use          = 'libvampplugin libqm-dsp'
++    obj.uselib       = 'FFTW3F VAMPSDK QMDSP KISSFFT KISSFFTR'
++    obj.use          = 'libvampplugin libqm-dsp libkiss_fft_double libkiss_fftr_double'
+     autowaf.ensure_visible_symbols (obj, True)
+     if bld.is_defined('HAVE_AUBIO4'):
+         obj.source += ' Onset.cpp '
diff --git a/ardour5.spec b/ardour5.spec
index c8a1ade..e23e035 100644
--- a/ardour5.spec
+++ b/ardour5.spec
@@ -30,7 +30,7 @@
 Name:       ardour5
 Version:    5.12.0
 
-Release:    1%{?dist}
+Release:    2%{?dist}
 Summary:    Digital Audio Workstation
 
 License:    GPLv3+
@@ -47,6 +47,8 @@ Source2:    gpl-3.0.txt
 Patch0:     ardour5-5.12.0-appdata.patch
 # Patched (untracked) revision.cc, created with the above
 Patch1:     ardour5-%{version}-appdata-revision.patch
+# QM-DSP library is missing kiss-fft functions (#1494796)
+Patch2:     %{name}-missing-kissfft.patch
 
 BuildRequires:  alsa-lib-devel
 BuildRequires:  aubio-devel >= 0.3.2
@@ -92,6 +94,7 @@ BuildRequires:  lv2-devel >= 1.0.0
 BuildRequires:  pangomm-devel >= 1.4
 # https://fedoraproject.org/wiki/Packaging:Python#Dependencies
 BuildRequires:  python2
+BuildRequires:  kiss-fft-devel
 BuildRequires:  qm-dsp-static
 BuildRequires:  readline-devel
 BuildRequires:  rubberband-devel >= 1.0
@@ -182,6 +185,7 @@ cp %{SOURCE1} %{SOURCE2} .
 
 %build
 export LC_ALL=en_US.UTF-8
+export LD_FLAGS="%{__global_ldflags}"
 ./waf configure \
 %if %{with strict}
     --strict \
@@ -338,6 +342,9 @@ fi
 %{_mandir}/*/man1/%{name}.1*
 
 %changelog
+* Wed Sep 27 2017 Guido Aulisi <guido.aulisi@gmail.com> - 5.12.0-2
+- Fix stretch Mode crashes ardour5 (#1494796)
+
 * Tue Sep 19 2017 Nils Philippsen <nils@tiptoe.de> - 5.12.0-1
 - version 5.12.0
 - enable push2 support