0.15.1 build failure

[Clint Adams]

I haven't looked into this at all, but configure dies with:

checking for additional compiler options...  -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings -Waggregate-return -Wmissing-declarations -Wmissing-format-attribute -Wnested-externs -ggdb -fno-common -Wchar-subscripts -Wcomment -Wimplicit -Wsequence-point -Wreturn-type -Wfloat-equal -Wpointer-arith -Wno-system-headers
checking for cos in -lm... yes
checking whether optreset is declared... no
checking whether db_create is declared... yes
checking for library providing db_create... no
configure: error: Can not locate a suitable Berkeley DB library.  Use --with-db=PATH to specify the path to a v3+ install directory