diff --git a/0ad.spec b/0ad.spec
index cd467df..cbebc15 100644
--- a/0ad.spec
+++ b/0ad.spec
@@ -10,6 +10,8 @@
 %global		dbg			%{nil}
 %endif
 
+%bcond_with	system_mozjs38
+
 # Remember to rerun licensecheck after every update:
 #	https://bugzilla.redhat.com/show_bug.cgi?id=818401#c46
 #	http://trac.wildfiregames.com/ticket/1682
@@ -23,7 +25,7 @@
 
 Name:		0ad
 Version:	0.0.23b
-Release:	9%{?dist}
+Release:	10%{?dist}
 # BSD License:
 #	build/premake/*
 #	libraries/source/miniupnpc/*		(not built/used)
@@ -102,12 +104,14 @@ BuildRequires:	wxGTK3-devel
 BuildRequires:	/usr/bin/appstream-util
 BuildRequires:	/usr/bin/python
 
+%if %{without system_mozjs38}
 # bundled mozjs
 BuildRequires:	pkgconfig(nspr)
 BuildRequires:	pkgconfig(libffi)
 BuildRequires:	pkgconfig(zlib)
 BuildRequires:	readline-devel
 BuildRequires:	/usr/bin/zip
+%endif
 
 # bundled mozjs: For build time tests only
 BuildRequires:	python2-devel
@@ -115,7 +119,9 @@ BuildRequires:	perl-devel
 
 ExclusiveArch:	%{ix86} x86_64 %{arm} aarch64 ppc64le
 
+%if %{without system_mozjs38}
 Provides: bundled(mozjs) = 38
+%endif
 
 # Only do fcollada debug build with enabling debug maintainer mode
 # It also prevents assumption there that it is building in x86
@@ -164,6 +170,9 @@ build/workspaces/update-workspaces.sh	\
     --bindir=%{_bindir}			\
     --datadir=%{_datadir}/%{name}	\
     --libdir=%{_libdir}/%{name}		\
+%if %{with system_mozjs38}
+    --with-system-mozjs38		\
+%endif
 %if %{with system_nvtt}
     --with-system-nvtt			\
 %endif
@@ -191,10 +200,13 @@ for name in nvcore nvimage nvmath nvtt; do
 done
 %endif
 
+%if %{without system_mozjs38}
 %if %{with debug}
-    install -p -m 755 binaries/system/libmozjs38-ps-debug.so %{buildroot}%{_libdir}/%{name}/libmozjs38-ps-debug.so
+name=mozjs38-ps-debug
 %else
-    install -p -m 755 binaries/system/libmozjs38-ps-release.so %{buildroot}%{_libdir}/%{name}/libmozjs38-ps-release.so
+name=mozjs38-ps-release
+%endif
+install -p -m 755 binaries/system/lib${name}.so %{buildroot}%{_libdir}/%{name}/lib${name}.so
 %endif
 
 install -d -m 755 %{buildroot}%{_datadir}/metainfo
@@ -244,6 +256,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/0ad.desktop
 %{_mandir}/man6/*.6*
 
 %changelog
+* Mon Sep 30 2019 pcpa <paulo.cesar.pereira.de.andrade@gmail.com> - 0.0.23b-10
+- Add build conditional for system mozjs38
+
 * Wed Sep 11 2019 Kalev Lember <klember@redhat.com> - 0.0.23b-9
 - Correctly install bundled mozjs38 (#1751250)
 - Exclude private libraries from autogenerated provides and requires