Fix requirement of the -devel package.

botan.spec

@@ -6,7 +6,7 @@
 
 Name:           botan
 Version:        %{major_version}.14
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Crypto library written in C++
 
 Group:          System Environment/Libraries
@@ -68,7 +68,11 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       pkgconfig
 Requires:       bzip2-devel
 Requires:       zlib-devel
+%if 0%{?fedora} >=26
+Requires:       compat-openssl10-devel
+%else
 Requires:       openssl-devel
+%endif
 
 %description    devel
 The %{name}-devel package contains libraries and header files for
@@ -261,7 +265,7 @@ LD_LIBRARY_PATH=%{buildroot}%{_libdir} ./check --validate
 
 
 %changelog
-* Fri Dec  9 2016 Thomas Moschny <thomas.moschny@gmx.de> - 1.10.14-1
+* Fri Dec  9 2016 Thomas Moschny <thomas.moschny@gmx.de> - 1.10.14-2
 - Update to 1.10.14.
 - Depend on OpenSSL 1.0 compat package for F26+.