diff --git a/eclib-vec.patch b/eclib-vec.patch
new file mode 100644
index 0000000..90c5a48
--- /dev/null
+++ b/eclib-vec.patch
@@ -0,0 +1,22 @@
+--- libsrc/symb.cc.orig	2017-12-19 10:31:41.000000000 -0700
++++ libsrc/symb.cc	2018-06-11 11:13:57.068763280 -0600
+@@ -154,7 +154,8 @@ symbdata::symbdata(long n) :moddata(n),s
+ //N.B. dlist include d=1 at 0 and d=mod at end, which we don't want here
+    for (ic=1; (ic<ndivs-1)&&(specials.count()<nsymb2); ic++)
+    { c=dlist[ic];
+-     dstarts[ic]=start=specials.count();
++     start=specials.count();
++     dstarts.assign(ic,start);
+      for (id=1; (id<modulus-phi)&&(specials.count()<nsymb2); id++)  
+      { d = noninvlist[id];
+        if (::gcd(d,c)==1)
+@@ -184,7 +185,8 @@ long symbdata::index2(long c, long d) co
+        return   modulus-code(xmodmul(kc,d,modulus));
+     else
+     {
+-     long start = dstarts[noninvdlist[-kc]];
++     long indx = noninvdlist[-kc];
++     long start = (indx < dstarts.size()) ? dstarts[indx] : 0;
+      symb s(c,d,this);
+      long ind = specials.index(s,start);
+      if(ind<0) 
diff --git a/eclib.spec b/eclib.spec
index 2321a77..2cc3810 100644
--- a/eclib.spec
+++ b/eclib.spec
@@ -2,7 +2,7 @@
 
 Name:           eclib
 Version:        20171219
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Library for Computations on Elliptic Curves
 License:        GPLv2+
 URL:            http://homepages.warwick.ac.uk/~masgaj/mwrank/
@@ -20,6 +20,8 @@ BuildRequires:  pari-devel
 Patch0:         %{name}-iszero.patch
 # Fix a name clash with boost
 Patch1:         %{name}-scalar.patch
+# Fix out of bounds vector accesses
+Patch2:         %{name}-vec.patch
 
 %description
 John Cremona's programs for enumerating and computing with elliptic
@@ -37,9 +39,7 @@ Development libraries and headers for %{name}.
 
 
 %prep
-%setup -q
-%patch0
-%patch1
+%autosetup -p0
 
 # Fix tests and programs on ARM
 sed -i 's/^LIBS.*/& -lpthread/' tests/Makefile.am
@@ -49,13 +49,11 @@ sed -i 's/^LIBS.*/& -lpthread/' progs/Makefile.am
 autoreconf -fi
 
 %build
-# FIXME: Defining _GLIBCXX_ASSERTIONS leads to segfaults in the test suite.
-export CFLAGS=$(sed 's/ -Wp,-D_GLIBCXX_ASSERTIONS//' <<< '%{optflags}')
 %ifarch %{ix86}
 # Excess precision leads to test failures
-export CFLAGS="$CFLAGS -ffloat-store"
-%endif
+export CFLAGS="%{optflags} -ffloat-store"
 export CXXFLAGS="$CFLAGS"
+%endif
 # FLINT_LEVEL 2 assumes that the C int type == half the width of a limb_t.
 # This is only true on 64 bit platforms.
 if [ %{__isa_bits} = "64" ]; then
@@ -67,6 +65,7 @@ fi
         --disable-static \
         --enable-shared \
         --with-flint \
+        --with-boost \
 %if %{with_allprogs}
         --enable-allprogs
 %else
@@ -117,6 +116,10 @@ make check LD_LIBRARY_PATH=$RPM_BUILD_ROOT%{_libdir}
 
 
 %changelog
+* Tue Jul  3 2018 Jerry James <loganjerry@gmail.com> - 20171219-2
+- Fix out of bounds vector accesses
+- Reenable use of boost
+
 * Sat Jun  2 2018 Jerry James <loganjerry@gmail.com> - 20171219-1
 - New upstream release
 - Work around FTBFS (bz 1582888)