diff --git a/gen_libs.sh b/gen_libs.sh
index 28f31b2..bdf83d6 100755
--- a/gen_libs.sh
+++ b/gen_libs.sh
@@ -3,7 +3,7 @@ set -e
 
 echo -n "Downloading header-only libraries..."
 mkdir deps
-wget https://github.com/nlohmann/json/releases/download/v3.1.1/json.hpp -O deps/json.hpp 2> /dev/null
+wget https://github.com/nlohmann/json/releases/download/v3.1.2/json.hpp -O deps/json.hpp 2> /dev/null
 wget https://github.com/mpark/variant/releases/download/v1.3.0/variant.hpp -O deps/variant.hpp 2> /dev/null
 echo " Done."
 
diff --git a/nheko.spec b/nheko.spec
index eebb5af..c35dc1e 100644
--- a/nheko.spec
+++ b/nheko.spec
@@ -6,6 +6,14 @@
 %global commit2 850100c0ac2b5a04720b2a1f09270749bf99f7dd
 %global shortcommit2 %(c=%{commit2}; echo ${c:0:7})
 
+# Due to GCC 7.3.1 regression https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84785
+# build under Fedora <= 28 using clang.
+%if 0%{?fedora} < 28
+%bcond_without clang
+%else
+%bcond_with clang
+%endif
+
 Summary: Desktop client for the Matrix protocol
 Name: nheko
 Version: 0.2.1
@@ -34,6 +42,14 @@ Source4: gen_libs.sh
 Patch0: %{name}-drop-flags.patch
 Patch1: %{name}-drop-rpath.patch
 
+%if %{with clang}
+BuildRequires: clang
+BuildRequires: llvm
+%else
+BuildRequires: gcc-c++
+BuildRequires: gcc
+%endif
+
 BuildRequires: cmake(Qt5Widgets)
 BuildRequires: cmake(Qt5Network)
 BuildRequires: cmake(Qt5Multimedia)
@@ -45,9 +61,7 @@ BuildRequires: libappstream-glib
 BuildRequires: ninja-build
 BuildRequires: lmdb-devel
 BuildRequires: doxygen
-BuildRequires: gcc-c++
 BuildRequires: cmake
-BuildRequires: gcc
 
 Requires: hicolor-icon-theme
 
@@ -69,11 +83,17 @@ pushd ".third-party"
     mv matrix-structs-%{commit2} matrix_structs
     pushd matrix_structs
         sed -i 's@add_library(${LIBRARY_NAME} ${SRC})@add_library(${LIBRARY_NAME} STATIC ${SRC})@g' CMakeLists.txt
+        sed -i '/-Werror/d' CMakeLists.txt
         tar -xf %{SOURCE3}
     popd
 popd
 
 %build
+%if %{with clang}
+export CC=clang
+export CXX=clang++
+%endif
+
 pushd %{_target_platform}
     %cmake -G Ninja -DCMAKE_BUILD_TYPE=Release ..
 popd
diff --git a/sources b/sources
index e1c8ea4..df984bc 100644
--- a/sources
+++ b/sources
@@ -1,4 +1,4 @@
-SHA512 (header_only.tar.gz) = c5b6f6bd9f0dd1ca0daee04048f733e306e6b4ac93c9100136a2714b28d0f9d17864362209359c4251ba65aeb69e14fbaf45942b27f47df9dccf2e268f3cbcb9
+SHA512 (header_only.tar.gz) = 6ce0b8740e690d196f0dfddeb8c2a93c2185e702ba574a606ab26e10c26f3a3aa421497489b3dcb3696e45aa4c5869eb9628493962179018e70ef05963c532ad
 SHA512 (lmdbxx-0b43ca8.tar.gz) = 025a945288a398b09549c91c98509a57912f8614c14b476e7c8d4fb0dc8fc1288fa1b3a33567cccea474277a1c48b3701f2df31e8a6acc851eb9549a9822f074
 SHA512 (matrix-structs-850100c.tar.gz) = 0cd10c865528ed5c5d80c889b7d9fc315796e12b69476696f7e10e745a7774c2a5866fc6de0a10b43ef4de2fb71bf3211899f7c68fa354ae013e28647decc899
 SHA512 (nheko-0.2.1.tar.gz) = 7d08c5c561c0388756b663da98b209c3074b61f5743cefa8f1ad21e3184b0de3973a8a6b129a0f1f602e6dbb3c99d7f0cf47e394a4c9527086a250aff7ca5b85