diff --git a/mp.spec b/mp.spec
index fd03e6c..9504ad6 100644
--- a/mp.spec
+++ b/mp.spec
@@ -2,11 +2,12 @@
 # mp's libraries are so installed in a private directory on epel6.
 # https://lists.centos.org/pipermail/centos-devel/2016-June/014820.html
 
-%if 0%{?fedora}
-%global with_jacop	0
+%if 0%{?fedora} && 0%{?fedora} > 26
+%global with_jacop	1
 # https://github.com/ampl/mp/issues/109
 %global with_gecode	0
-%else
+%endif
+%if 0%{?rhel}
 %global with_jacop	0
 %global with_gecode	1
 %endif
@@ -20,7 +21,7 @@
 
 Name: mp
 Version: 3.1.0
-Release: 12.%{date}git%(echo %{checkout} | cut -c-6)%{?dist}
+Release: 13.%{date}git%(echo %{checkout} | cut -c-6)%{?dist}
 License: MIT and BSD
 Summary: An open-source library for mathematical programming
 URL: https://github.com/ampl/mp
@@ -42,10 +43,10 @@ BuildRequires: cmake3
 %else
 BuildRequires: cmake
 %endif
-%if %{with_gecode}
+%if 0%{?with_gecode}
 BuildRequires: gecode-devel
 %endif
-%if %{with_jacop}
+%if 0%{?with_jacop}
 BuildRequires: jacop
 BuildRequires: java-devel
 %endif
@@ -103,7 +104,7 @@ for %{name}.
 
 %patch2 -p1 -b .jni
 
-%if %{with_jacop}
+%if 0%{?with_jacop}
 ln -s %{_javadir}/jacop/jacop.jar thirdparty/jacop/jacop-`rpm -q --qf "%%{VERSION}" jacop`.jar
 %endif
 
@@ -115,10 +116,10 @@ export LIBS="-lgsl -L%{_libdir}/atlas -lcblas -latlas"
 %endif
 
 mkdir build && pushd build
-%if %{with_gecode}
+%if 0%{?with_gecode}
 BUILD="gecode"
 %endif
-%if %{with_jacop}
+%if 0%{?with_jacop}
 BUILD="$BUILD,jacop"
 %endif
 BUILD="$BUILD,gsl,smpswriter"
@@ -181,11 +182,11 @@ install -pm 755 build/bin/ampltabl.dll %{buildroot}%{_libdir}/%{name}/bin
 install -pm 755 build/bin/arithchk %{buildroot}%{_libdir}/%{name}/bin
 install -pm 755 build/bin/cp.dll %{buildroot}%{_libdir}/%{name}/bin
 install -pm 755 build/bin/fullbit.dll %{buildroot}%{_libdir}/%{name}/bin
-%if %{with_gecode}
+%if 0%{?with_gecode}
 install -pm 755 build/bin/gecode %{buildroot}%{_libdir}/%{name}/bin
 %endif
 install -pm 755 build/bin/gjh %{buildroot}%{_libdir}/%{name}/bin
-%if %{with_jacop}
+%if 0%{?with_jacop}
 install -pm 755 build/bin/jacop %{buildroot}%{_libdir}/%{name}/bin
 %endif
 install -pm 755 build/bin/smpswriter %{buildroot}%{_libdir}/%{name}/bin
@@ -212,7 +213,7 @@ chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/cp.dll
 chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/fullbit.dll
 chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/gecode
 chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/gjh
-%if %{with_jacop}
+%if 0%{?with_jacop}
 chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/jacop
 %endif
 chrpath --replace %{_libdir}/%{name} %{buildroot}%{_libdir}/%{name}/bin/smpswriter
@@ -235,11 +236,11 @@ chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/ampltabl.dll
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/arithchk
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/cp.dll
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/fullbit.dll
-%if %{with_gecode}
+%if 0%{?with_gecode}
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/gecode
 %endif
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/gjh
-%if %{with_jacop}
+%if 0%{?with_jacop}
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/jacop
 %endif
 chrpath --delete %{buildroot}%{_libdir}/%{name}/bin/smpswriter
@@ -290,6 +291,9 @@ ctest --force-new-ctest-process --parallel %{?_smp_mflags} -I 4,15,,1,17,28
 %{_includedir}/mp
 
 %changelog
+* Wed Nov 15 2017 Antonio Trande <sagitter@fedoraproject.org.com> - 3.1.0-13.20160810git1f3980
+- Enable jacop on f27+
+
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 3.1.0-12.20161124git1f3980
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild