diff --git a/lv2-x42-plugins-complex.patch b/lv2-x42-plugins-complex.patch
new file mode 100644
index 0000000..5f61d76
--- /dev/null
+++ b/lv2-x42-plugins-complex.patch
@@ -0,0 +1,14 @@
+diff --git a/tuna.lv2/src/spectr.c b/tuna.lv2/src/spectr.c
+index 665ad4f..e9e06cc 100644
+--- a/tuna.lv2/src/spectr.c
++++ b/tuna.lv2/src/spectr.c
+@@ -31,6 +31,9 @@
+ # define creal(XX) std::real(XX)
+ # define cimag(XX) std::imag(XX)
+ # define _I ((complex_t)(1i))
++  #ifdef __cpp_lib_complex_udls
++    using namespace std::literals::complex_literals;
++  #endif
+   typedef std::complex<double> complex_t;
+ #else
+ # include <complex.h>
diff --git a/lv2-x42-plugins-ftbs-glibc-2.27.patch b/lv2-x42-plugins-ftbs-glibc-2.27.patch
new file mode 100644
index 0000000..1bc0277
--- /dev/null
+++ b/lv2-x42-plugins-ftbs-glibc-2.27.patch
@@ -0,0 +1,13 @@
+diff --git a/meters.lv2/gui/phasewheel.c b/meters.lv2/gui/phasewheel.c
+index 44a6e70..48fa20a 100644
+--- a/meters.lv2/gui/phasewheel.c
++++ b/meters.lv2/gui/phasewheel.c
+@@ -812,7 +812,7 @@ static bool cb_set_gain (RobWidget* handle, void *data) {
+ 		queue_draw(ui->m2);
+ 	}
+ #ifdef __USE_GNU
+-	const float thresh = pow10f(.05 * (MIN_CUTOFF - val));
++	const float thresh = exp10f(.05 * (MIN_CUTOFF - val));
+ #else
+ 	const float thresh = powf(10, .05 * (MIN_CUTOFF - val));
+ #endif
diff --git a/lv2-x42-plugins.spec b/lv2-x42-plugins.spec
index 57198e9..71468ac 100644
--- a/lv2-x42-plugins.spec
+++ b/lv2-x42-plugins.spec
@@ -2,7 +2,7 @@
 
 Name:           lv2-x42-plugins
 Version:        0.3.0
-Release:        0.4.%{prerelease}%{?dist}
+Release:        0.5.%{prerelease}%{?dist}
 Summary:        A number of LV2 plugins
 
 # files in balance.lv2/pugl are ISC, the rest are GPLv2+
@@ -11,6 +11,14 @@ URL:            https://github.com/x42/x42-plugins
 # A tarball is now provided at http://gareus.org/misc/x42-plugins.php
 Source0:        http://gareus.org/misc/x42-plugins/x42-plugins-%{prerelease}.tar.xz
 Source1:        README.md
+
+# Obsolete pow10 functions
+# https://sourceware.org/git/?p=glibc.git;a=commit;h=5a80d39d0d2587e9bd8e72f19e92eeb2a66fbe9e
+Patch0:         %{name}-ftbs-glibc-2.27.patch
+# complex operator""i are declared in the namespace std::literals::complex_literals
+# http://en.cppreference.com/w/cpp/numeric/complex/operator%22%22i
+Patch1:         %{name}-complex.patch
+
 BuildRequires:  gcc-c++
 BuildRequires:  lv2-devel >= 1.8.1
 BuildRequires:  zita-convolver-devel
@@ -40,6 +48,8 @@ convolver, fader, parametric equalizer, auto-tune.
 
 %prep
 %setup -q -n x42-plugins-%{prerelease}
+%patch0 -p1
+%patch1 -p1
 cp -p %{SOURCE1} .
 
 %build
@@ -57,6 +67,7 @@ export FONTFILE="/usr/share/fonts/gnu-free/FreeSansBold.ttf"
 export STRIP=/bin/true
 export OPTIMIZATIONS="%{optflags} ${flags}"
 export CFLAGS="%{optflags}"
+export CXXFLAGS="%{optflags}"
 export LDFLAGS="%{__global_ldflags} -lpthread"
 %make_build LIBDIR=%{_libdir} LV2DIR=%{_libdir}/lv2 PREFIX=%{_prefix}
 
@@ -72,6 +83,9 @@ export LDFLAGS="%{__global_ldflags} -lpthread"
 %{_mandir}/man1/x42*
 
 %changelog
+* Tue Feb 13 2018 Guido Aulisi <guido.aulisi@gmail.com> - 0.3.0-0.5.20170428
+- Fix FTBS with glibc 2.27 and gcc 8
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.0-0.4.20170428
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild