diff --git a/libxcrypt.spec b/libxcrypt.spec
index a46897a..f2390ef 100644
--- a/libxcrypt.spec
+++ b/libxcrypt.spec
@@ -165,7 +165,11 @@ Patch0001:      %{url}/commit/8d109010f022ac75e383ac74d1961c0c63a16c3a.patch#/%{
 
 # Patch 6000 - 9999: Downstream patches.
 
+BuildRequires:  autoconf
+BuildRequires:  automake
 BuildRequires:  fipscheck
+BuildRequires:  gcc
+BuildRequires:  glibc-devel           >= %{glibc_minver}
 BuildRequires:  libtool
 %if %{with memcheck}
 BuildRequires:  valgrind