diff --git a/aegisub.changes b/aegisub.changes
index 288e98d..f3f04f1 100644
--- a/aegisub.changes
+++ b/aegisub.changes
@@ -8,6 +8,7 @@ Thu Aug 30 10:26:57 UTC 2018 - davejplater@gmail.com
   aegisub.build-compare.patch, icu59.patch and aegisub-icu.patch.
 - Rebased Makefile.inc.in.patch, aegisub-no-optimize.patch and
   remove-vendor-luajit-dependency.patch.
+- Exclude i586 from build due to unexplainable missing library.
 - For upstream changes see:
   /usr/share/doc/packages/aegisub/changelog.txt
 
diff --git a/aegisub.spec b/aegisub.spec
index 419ed2e..d9166b2 100644
--- a/aegisub.spec
+++ b/aegisub.spec
@@ -38,9 +38,11 @@ BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  gcc-c++
 BuildRequires:  intltool
+BuildRequires:  libboost_chrono-devel
 BuildRequires:  libboost_filesystem-devel
 BuildRequires:  libboost_locale-devel
 BuildRequires:  libboost_regex-devel
+BuildRequires:  libboost_system-devel
 BuildRequires:  libboost_thread-devel
 BuildRequires:  lua51
 BuildRequires:  pkgconfig >= 0.20
@@ -55,7 +57,7 @@ BuildRequires:  pkgconfig(libass)
 BuildRequires:  pkgconfig(libpulse) >= 0.5
 BuildRequires:  pkgconfig(luajit)
 BuildRequires:  pkgconfig(zlib)
-ExcludeArch:    ppc ppc64 ppc64le
+ExcludeArch:    ppc ppc64 ppc64le i586
 
 %description
 Aegisub is an advanced subtitle editor for Windows, and UNIX-like systems, such